There is a specific kind of sound that only happens when two reverbs are fighting for the same air. Not a reverb with a modulation switch. Not a reverb with a shimmer setting bolted onto the side. Two genuinely separate reverb processors, each with its own full share of computing power, each running a different algorithm, either stacked one into the other or spread across the stereo field like weather systems colliding over the Atlantic.
That is what the Source Audio Ventris Dual Reverb does, and it is the entire reason the pedal exists. Everything else — the MIDI, the Neuro editor, the 128 presets, the spillover that refuses to guillotine your reverb tail when you change patches — is downstream of one architectural decision made in a small engineering room in Woburn, Massachusetts: put two 56-bit DSPs in the enclosure instead of one, and refuse to make them share.
Premier Guitar’s Charles Saufley opened his review by joking that the stompbox industry had reached “peak digital reverb,” an era of Hans Zimmer giganto-verbs nobody asked for. Then he spent the rest of the review explaining why the Ventris was the exception. Sound On Sound’s Paul White went further and suggested Source Audio might be underselling it. Both magazines arrived at the same place from opposite directions, which does not happen often.
This is a feature, not a review. What follows is what the Ventris actually is, where it came from, who has genuinely been caught using one, how to program it, and how it stacks up against the reverbs it shares pedalboard real estate with.
The One Series Context: Where the Ventris Came From
Source Audio is a Massachusetts company that spent its early years making things most guitarists never encountered — the Hot Hand motion-controlled ring, the Soundblox and Soundblox 2 series, a body of DSP work that sat slightly to the side of the pedalboard mainstream. The One Series changed that. Standard 4.5 x 4.5 inch anodized aluminum boxes, deep editing via a free app, MIDI as a first-class citizen rather than an afterthought, and a house philosophy that a pedal should be simple enough to use out of the box and bottomless if you want to go there.
The Ventris arrived in that line in 2018, following the Nemesis Delay (2016) and preceding the Collider Delay+Reverb, which effectively fused the two. Premier Guitar reviewed it on 1 May 2018 at $399 street and handed it a Gear Award for that year. Sound On Sound ran Paul White’s review in the June 2018 issue at £399 including VAT.
Two Engineers, Two Processors
Source Audio credits the Ventris sound design to a two-man team: Bob Chidlaw, the company’s Chief Scientist, and Jesse Remignanti. Chidlaw’s name recurs across the whole Source Audio catalogue, and his background is the thing worth knowing — he was head engineer at Kurzweil Music during the 1980s and 90s, which is to say he was building high-end digital instruments back when a reverb algorithm was a research project rather than a menu item. The company explicitly traces the Ventris True Spring engine back through his Kurzweil years and his work on the Soundblox 2 Dimension Reverb.
The dual-DSP decision is the interesting one, and Source Audio’s own explanation of it is unusually candid for marketing copy. Their argument is that a single-processor multi-reverb forces the designer to ration: allocate maybe five percent of the available horsepower to something as computationally expensive as a convincing spring tank, and the spring tank suffers. With two processors, an engine can have a hundred percent of one chip. The spring reverb on the Ventris is good because nothing else was running on that silicon.
The second processor buys three things. Spillover, so switching presets does not chop off the decaying tail of the previous one — the old preset keeps ringing on processor A while processor B starts the new one. Simultaneous dual reverbs, in series, in parallel, or split hard left and right. And headroom, in the design sense: nobody had to compromise an algorithm to make room for its neighbours.
The catch, and Source Audio states it plainly, is that you cannot have both at once. Put the toggle in A+B and you get dual reverbs but no spillover, because both processors are already busy. That is an honest engineering trade, not a bug.
Source Audio Ventris Dual Reverb: Full Specifications
The Fourteen Engines, One at a Time
Twelve live on the rotary selector. Two more — Outboard Spring and Metal Box — are downloadable through Neuro and can be burned to any position on that wheel, replacing whichever engine you never use. That last detail is the most under-sold feature on the whole pedal: the front panel is user-configurable. The engine list you get out of the box is a suggestion, not a specification.
The Natural Spaces
Room is the workhorse — anything from a small warm domestic space to a theatre. Control 1 and Control 2 default to Bass and Mod Depth here, with mod rate available in the editor or on the Option footswitch. Hall L is the one modelled on 1980s studio rack units, and it behaves like them: highly diffuse, with a blooming swell as the tail develops rather than an instant wash. E-Dome — Source Audio’s own copy calls it the “Enormo-Dome” — is the arena setting, long trails with smooth modulation baked in. It is the engine people buy the pedal for and then use least, which is normal for the biggest reverb in any box.
The Mechanical Ones
True Spring is the flagship, and it is where Chidlaw’s Kurzweil pedigree earns its keep. Saufley, comparing it directly against actual Fender amp tanks, found the real ones darker and much noisier, and concluded that with the bass EQ and spring-length secondary controls dialled you would be unlikely to hear the difference outside total isolation. Paul White simply said it captures “the twangy essence of the real thing perfectly.” Outboard Spring, the Neuro download, is a different animal — modelled on standalone tanks like the Fender 6G15 and the SurfyBear rather than on a reverb built into an amp, which means far more aggressive drip in the early reflections. If you play surf, that is the one. Plate is the 1950s and 60s sheet-metal sound, simple and beautiful and enormously useful on vocals and snares if you ever put this pedal in a studio rack, which people do.
The Unnatural Ones
Lo-Fi takes the whole premise of reverb as luxury and inverts it — distortion, oversaturation, pitch drift, deliberate ugliness. Modverb is a vintage-minded modulated reverb that uses amp-style tremolo rather than chorus or vibrato, and it can be applied to the wet signal, the dry signal, or both. Saufley called the effect “intoxicating” at extreme settings. Shimmer does the octave-up trick, but the interval is editable in Neuro, and holding the Option switch produces a dive-bombing pitch drop. White singled it out for having no audible pitch-shifting artefacts. Echoverb is reverb and delay together, and turned down it works as a straightforward delay pedal. Swell applies a volume swell to your dry signal before feeding it into the reverb, which is a completely different result from swelling with a volume pedal after the fact.
Offspring is the strange one, and every reviewer reached for a different metaphor. Source Audio: somewhere between an angel’s harp and a retro-futuristic sci-fi soundtrack. Saufley: the aural equivalent of refracted light through dewdrops or splintered glass. It combines high octaves with an arpeggio effect and a repeating delay set by the pre-delay knob. Saufley’s practical note is the useful one — at low mix levels it can sound stiff outside rhythmic arpeggiated parts, at high mix levels it deserves its own preset for intros and outros. Reverse is the backwards engine, menacing at 100 percent wet and an unnerving shadow when mixed in. Metal Box, the second Neuro download, is Chidlaw’s small-room-with-extremely-reflective-walls idea — a guitar amp inside a shipping container. Wind the modulation up and the time down and it becomes a chorus.
Controls and Workflow
Everything lives on the top panel. Six knobs: Time, Pre-Delay, Mix, Treble (a genuine cut/boost, not just a rolloff), and Control 1 and Control 2, whose functions change per engine. A twelve-position rotary selector with an LED at every position. A three-way A / A+B / B toggle. Two footswitches, four preset LEDs and a preset select/save button.
The toggle is the key to the whole instrument, and it does double duty. In the A position, the panel knobs edit reverb A. In B, they edit reverb B. In A+B the knobs are reassigned: Control 1 becomes the wet level of reverb A, Control 2 the wet level of reverb B, and Mix becomes the level of the dry signal. That reassignment is the bit that trips up new owners, and it is also what makes the pedal genuinely playable in dual mode rather than a menu exercise.
Saufley’s description of getting there is worth quoting for how undramatic it is: a flick of the toggle and a press of the top-mounted button. Switching between cascade and parallel is not buried.
The Option footswitch responds differently to a tap than to a hold, with sensible defaults per engine, and can be reassigned globally to preset scrolling, A/B toggling, Hold, Runaway Reverb or tap tempo. Hold loops a small slice of the reverb tail and sustains it while you play over the top, either dry or through the second processor. Runaway does the same but feeds the loop back into the reverb, building toward self-oscillation — dub territory.
Neuro 3
The free editor exists for desktop (Mac and Windows) and mobile (iOS and Android). It gives you roughly twelve additional parameters per engine, dual-engine routing configuration, control assignments, the bonus engine downloads, firmware updates, and a shared community preset library. Paul White, reviewing a beta build, called it “a doddle to use” and — importantly — added that you will not feel cheated if you never open it.
Connection is the fiddly part and it is worth spelling out. The desktop editor talks to the pedal over mini USB Type B — not micro, not C. The mobile app historically connected through your phone’s headphone jack into stereo Input 2 using the supplied 1/8″-to-1/4″ cable, an audio-data link where tip carries audio and ring carries data, which means modern phones need a dongle. Source Audio has since added two-way USB connectivity to the mobile app (Lightning-to-mini-B for iPhone, USB-C-to-mini-B for Android), which is the better route now — it lets the app display your actual pedal settings in real time.
Famous Players: What Actually Holds Up
Reverb pedals attract fake rosters more than any other category, because reverb is the effect everyone assumes everyone uses. Here is what survives being checked.
Robin Guthrie — Cocteau Twins
This is the one, and it is a beauty. Robin Guthrie, the architect of the Cocteau Twins’ entire sonic world, told Guitar World: “I’ve got this really interesting reverb that I’ve been using. In about 2017/2018, I bought a Source Audio Ventris pedal, which I can use for a lot of reverb-y things now. It’s like my go-to big, swirly reverb at the moment.”
First person, dated, unambiguous, and from the man who more or less invented the vocabulary that shoegaze and dream pop were later built on — the guitarist cited as a foundational influence alongside the Cure and the Jesus and Mary Chain by first-wave shoegazers including My Bloody Valentine’s Kevin Shields. Source Audio were so pleased with the discovery that they wrote a blog post about it in December 2022, and helpfully included their own recipe for the Heaven or Las Vegas sound: the Hall engine at any size, with the pre-delay pushed to noon or beyond so the reverb arrives late enough to read as a gated 80s effect. That is a manufacturer telling you how to cop one of their own artists’ records, which is rare and generous.
Bartees Strange
Confirmed in the written text of Premier Guitar’s Rig Rundown, filmed at Nashville’s Basement East in late 2022 and published February 2023. Strange’s time-based section is an Alexander Pedals Rewind, a Boss DM-3 and the Ventris. The surrounding board is a genuinely strange collection — Land Devices HP-2, Fowl Sounds Obsidian, Bondi Breakers, ZVEX Box of Rock, a Chase Bliss Blooper, a Fairfield Circuitry Shallow Water — through a Vox AC30C2X. Worth noting that his bandmate Dan Kleederman runs a Source Audio Collider on the same stage, which makes that band a two-Source-Audio operation on opposite sides of the riser.
Michael Risberg — Elder
Widely reported, including by gear aggregators citing Premier Guitar’s April 2020 Elder Rig Rundown, and entirely plausible given the band’s Hiwatt-and-Strymon psychedelic setup. But we will be straight with you: the Ventris appears in the video segment rather than in PG’s written article, so we could not confirm it in text from the primary source. Treat it as strong but not documented in print.
The Roster That Does Not Survive
Aggregator listings for the Ventris routinely attach The Edge, John Mayer, Mark Lettieri and Mateus Asato to this pedal. The dates alone dispose of most of it. The Ventris shipped in 2018. The Edge’s reverb identity was built across the early 1980s out of an AMS RMX16 and Lexicon rack units, and his current touring rig is a MIDI-controlled rack system rather than a stompbox reverb. We could find no first-party evidence for any of the four using a Ventris.
What has almost certainly happened is the same mechanism we documented on the Nemesis Delay: manufacturers name factory presets after sounds, aggregators read preset names as endorsements, and the endorsement propagates. Ambient-guitar pedals are especially prone to it because “the kind of player who would use this” is an easy sentence to write and a hard one to check.
A Warning About the Name “Guthrie”
Search for the Ventris quote above and you will hit a trap we walked into ourselves. There are two prominent guitarists called Guthrie: Guthrie Govan, the Aristocrats virtuoso, and Robin Guthrie of the Cocteau Twins. The Ventris quote is Robin’s. Govan has nothing to do with it. If you see the “go-to big, swirly reverb” line attributed to Govan anywhere, it has been mangled in transit.
Demos, Not Endorsements
Source Audio’s own Ventris video page features Pete Thorn, Mike Hermans, Andy from Reverb.com and a genuinely absurd two-hour deep dive from Wire Dream Disasters that walks the entire selector wheel. These are demo videos. They tell you the pedal sounds good in capable hands; they do not tell you anyone tours with one.
Eight Tone Recipes
1. Heaven or Las Vegas
Source Audio’s own Robin Guthrie recipe, and the best starting point on the pedal. Hall L, any size. Pre-Delay at noon or higher — this is the whole trick, it delays the onset of the reverb until it reads as a separate gated event rather than as room. Mix around 40 percent, Treble slightly up, modulation present but gentle. Play arpeggiated major-seventh voicings high on the neck with a chorus in front and let the pre-delay do the work.
2. The Honest Surf Tank
Outboard Spring (downloaded to a selector position via Neuro), Time short, Mix around 40 to 50 percent, Treble up, drip control maximised. Bridge pickup, tremolo picking, no gain in front. If you are comparing against an amp with a real tank, run the Ventris in stereo into a second amp and let them disagree slightly — that phase difference is what real rooms have and single-amp digital reverb does not.
3. Cascaded Reverse Into Spring
Saufley’s favourite mashup, and the argument for the whole dual architecture. A+B toggle, cascade routing, Reverse into True Spring. Control 1 and Control 2 set the two wet levels; start both around 10 o’clock and Mix at 2 o’clock for dry level. What you get is not two effects but a single new one — the spring tank reacting to backwards material behaves like nothing that exists physically.
4. Parallel Split for Stereo Rigs
A+B, parallel routing, Room on A and E-Dome on B, then use Neuro to send one to each output. Two amps, hard left and right. The small room glues your attack to the front of the stage while the arena reverb happens behind the audience. This is the setting that makes people who have never taken stereo seriously start taking stereo seriously.
5. Cascade as Overdrive
Saufley’s most interesting observation is that cascaded reverbs, with the right pairing, develop “complex, organic overdrive qualities” that fatten lead tones without losing nuance. Try Plate into Hall L in cascade, both wet levels modest, Time on the second engine long. It is not distortion, but the density does something to sustained bends that a single reverb cannot.
6. The Runaway Dub Build
Assign Option to Runaway Reverb. Any large engine, E-Dome or Hall L, Time long. Hit a chord, stamp Runaway, and let the feedback loop climb. Release before it consumes the mix — or don’t, if that is the song. Pairs well with a delay ahead of it; try the Nemesis or a tape-voiced delay so the loop inherits some wobble.
7. Ugly on Purpose
Lo-Fi engine, Time medium, Treble cut hard, Mix high. Then put a fuzz after the pedal rather than before it, so the fuzz is chewing on the reverb rather than the other way around. The result is closer to a broken tape machine than to a room, and it is the single fastest way to stop a pretty part from being merely pretty.
8. Studio Plate on the Send
Plate, Mix at 100 percent wet, Time to taste, Treble slightly cut. The 1 MΩ input, 600 Ω output and +6.54 dBV headroom mean the Ventris is perfectly happy in an effects loop or on a console send, and the stereo I/O means it behaves like an outboard unit. On drum overheads and vocals it is not slumming — this is genuine studio-grade reverb in a stompbox, which is exactly what Paul White was getting at when he said Source Audio might be selling it too cheaply.
How the Ventris Compares
Ventris vs Strymon BigSky
The obvious duel. The BigSky has twelve machines, a display, three footswitches and an interface widely considered the friendliest in the category. The Ventris has two processors and no display. Practically: the BigSky is easier to browse and better at big beautiful stock sounds; the Ventris is better at combinations nobody has heard before, better at spring, and cheaper. If you want to pick a reverb quickly, BigSky. If you want to build one, Ventris.
Ventris vs Eventide Space
Space comes from the H3000 rack lineage and its strengths are the weird algorithms — Blackhole, MangledVerb, DualVerb. Note that Space’s own “DualVerb” runs two reverbs on one processor, which is exactly the ration Source Audio designed around. Space is more extreme at its edges; the Ventris is more convincing in the middle and has proper spillover. Space also has the awkward two-switch tuner press and left-side jacks; the Ventris has neither problem.
Ventris vs Source Audio Collider
Family business. The Collider puts delay and reverb in one box using the same dual-DSP idea — effectively a Nemesis and a Ventris sharing an enclosure, with a subset of each one’s engines. If you need both effects and one pedalboard slot, Collider. If reverb is the thing you actually care about and you want the full engine list plus the ability to run two reverbs against each other, Ventris. They are not upgrades of one another; they are different answers.
Ventris vs Meris Mercury7 and LVX
The Mercury7 is a specialist — a beautiful, narrow, cinematic reverb that does one aesthetic superbly. The LVX is a modular system with a learning curve to match. The Ventris sits between: broader than the Mercury7, far more immediate than the LVX, and the only one of the three with two full processors.
Ventris vs the Compact Reverbs
Against the EHX Oceans 11, the TC Hall of Fame 2, the Boss RV-6 or the Walrus Fathom, the Ventris is a different class of purchase entirely — three to five times the money, four times the depth, and considerably more than most players need. White’s own caveat applies: if you want a splash of reverb to take the dryness off a live sound, this is overkill. The compact boxes exist because that is a real and common requirement.
Ventris vs Boss RV-500
The closest thing to a direct competitor on features. The RV-500 has a screen, twelve modes with 21 variations, deep MIDI, and Boss’s build reputation. It also runs a dual-engine architecture of its own. The distinctions come down to interface philosophy — Boss gives you a display and menus, Source Audio gives you one knob per function and pushes the depth into a computer — and to spring reverb, where the Ventris has the edge.
Buying Guide
The Ventris is currently $429 direct from Source Audio, up from a $399 street price at launch in 2018 — a nominal increase of roughly 7.5 percent across eight years, which in real terms is a price cut. Used examples turn up regularly and hold value reasonably well.
Buy one if: reverb is a compositional element in your music rather than a finishing touch; you run stereo, or want to; you need spring reverb that stands up next to an actual tank; you are building a MIDI-controlled board and want a reverb that does not need an adapter to join it; you like the idea of a pedal whose front panel you can reconfigure.
Look elsewhere if: you want a reverb you can dial in without ever thinking about it — the Ventris rewards attention and does not demand it, but you will be paying for depth you do not use. Also consider power: 280 mA is a substantial draw, and a small daisy chain will not cover it. Budget an isolated supply output.
Buying Used
Check the USB port physically — it is mini Type B and it is the pedal’s lifeline to firmware and the editor, so a damaged one is a real problem. Ask whether the seller has run firmware updates through Neuro; a unit that has never been updated is not broken, but it may be missing the downloadable engines and improvements. Confirm the 1/8″-to-1/4″ Neuro cable is included, though it is cheap to replace. And ask whether it has ever been paired with a Neuro Hub, purely because a seller who knows the answer is a seller who understood the pedal.
Living With It
Power. 280 mA at 9V, centre negative, no battery option. Standard Boss-style polarity, unlike Eventide’s Factor series, so at least the plug is not a trap. Give it its own isolated output.
Presets. Four LEDs suggest four presets. There are eight, via Preset Extension Mode in the editor, and 128 via MIDI program change. Turn on Extension Mode before you conclude the pedal is short on storage.
The colour. Saufley’s only aesthetic gripe was that gunmetal grey on a dark stage is hard to read. He is right. A strip of coloured tape next to the selector positions you actually use is a two-minute fix.
Digital artefacts. The single Con in Premier Guitar’s review was some digital artefacting at high treble settings, and specifically on the trebliest True Spring settings. Saufley himself was not certain he was hearing digital artefacts rather than accurate modelling of the cold overtones a treble-heavy spring produces. Either way: if a spring setting sounds brittle, pull the Treble back before you blame the pedal.
The A+B knob remap. Say it once more, because it is the thing that generates the most confused forum posts: in A+B mode, Control 1 and Control 2 become the wet levels of the two reverbs and Mix becomes the dry level. Nothing is broken.
Stock availability. Source Audio publicly acknowledged that the Ventris spent most of 2022 out of production due to component shortages, with a new batch arriving in January 2023. Supply has normalised since, but it explains why used prices were odd for a while and why some dealers still treat it as a special-order item.
Frequently Asked Questions
How many reverbs does the Ventris actually have?
Fourteen engines. Twelve are on the rotary selector out of the box — Room, Hall L, E-Dome, True Spring, Plate, Lo-Fi, Modverb, Shimmer, Echoverb, Swell, Offspring and Reverse. Two more, Outboard Spring and Metal Box, are free downloads via Neuro and can be burned onto any selector position, replacing an engine you do not use. Source Audio has continued to add engines over time.
Can I really run two reverbs at once?
Yes, and it is the point of the pedal. Set the toggle to A+B and you can run the two engines in series (cascaded), in parallel, or split so each one feeds a different output. The trade-off is that spillover between presets is unavailable while both processors are occupied.
What is spillover and why does it need two processors?
Spillover means the reverb tail of the preset you are leaving keeps decaying naturally while the new preset starts. It needs two processors because one has to keep rendering the old tail while the other builds the new sound. Single-DSP reverbs either cut the tail off or fake it. With Neuro you can even set the decay rate of that outgoing tail.
Do I need the Neuro app to use it?
No. Paul White made a point of saying you will not feel cheated if you never open it. The editor adds roughly twelve extra parameters per engine, the bonus engines, routing configuration, preset sharing and firmware updates — but the twelve onboard engines and six knobs are a complete pedal on their own.
Does the Ventris need a MIDI adapter?
No, and this is one of its quiet advantages within the One Series. It has 5-pin MIDI DIN In and Thru jacks built in, so it needs nothing but a controller and cables. Several other One Series pedals require the MIDI Adapter or the Neuro Hub. It also takes MIDI over USB from a DAW.
How much power does it draw?
280 mA at 9V DC, centre negative, with no battery option. That is enough to matter — plan for an isolated output on a decent supply rather than sharing a daisy chain.
Is the spring reverb good enough to replace an amp tank?
Close enough that Premier Guitar, comparing it against several real Fender tanks, concluded you would be unlikely to notice differences outside total isolation — the real ones were darker and noisier. If you want outright drip, download the Outboard Spring engine, which models standalone tanks like the 6G15 rather than amp-built reverb.
Ventris or Collider?
Ventris if reverb is your priority and you want the full engine list plus dual-reverb combinations. Collider if you need delay and reverb in one slot and can live with a subset of each pedal’s engines. Both use the same dual-DSP architecture and the same Neuro ecosystem, so neither is a compromised version of the other.
Can I use it as a studio reverb?
Yes, and it is arguably underrated in that role. Stereo in and out, 1 MΩ in and 600 Ω out, +6.54 dBV maximum level, 24-bit conversion, 110 dB dynamic range, class-compliant USB and full MIDI. Sound On Sound reviewed it as a studio device with footswitches and concluded the price was more than fair for what it is.