Audio Damage Traverse [WiN-MAC-LiNUX]

• Product: AD064 Traverse
• Developer: Audio Damage
• Version: 1.0.0
• Format: VST3, AU, AAX, CLAP
• Minimum System Requirements: Windows 10, macOS 10.13, Ubuntu 20
• Source: audiodamage.com/collections/effects/products/ad064-traverse

Traverse is a lo-fi tape effect and stereo delay in one plugin. The cassette engine runs a physics-based hysteresis saturation model — state-dependent, not a static waveshaper — behind Drive, Wow, Flutter, and a tilt-EQ Tone control. In default routing, those tape effects sit inside the delay feedback loop: every repeat passes through the full cassette chain again, accumulating saturation, tone shift, and pitch modulation cumulatively. A Post-Delay toggle reverses this, moving the cassette after the delay for a more conventional tape-colored delay architecture.

Key Takeaway

Sessions built on sustained sources — pads, held vocals, drone guitars — belong inside the default topology, where saturation and pitch drift accumulate per repeat. Post-Delay reconfigures to a conventional tape-colored delay. Mix fuses cassette and delay to one control with no independent split. Producers needing an uncolored input path with tape-shaped repeats start in Post-Delay.

Signal History in the Saturation Curve

The cassette engine uses a physics-based hysteresis model: state-dependent nonlinearity wrapped between pre-emphasis and de-emphasis filters, with oversampling at the saturator stage. The hysteresis curve changes shape based on what the signal was doing before the current sample — past input amplitude and direction influence the current saturation response. A signal building to a peak saturates differently than one decaying from the same level. That state-dependence adds dynamic compression to the harmonic generation; the two emerge from the same curve, not sequentially.

At low Drive, the cassette chain adds warmth without announcing itself. As Drive climbs, the response crosses from tonal coloration into soft-knee compression: the signal compresses alongside the added harmonic content rather than one preceding the other. At higher settings the behavior reads as an overloaded cassette deck — compressed, harmonically dense, increasingly distorted at transient peaks. Internal gain compensation keeps output level consistent through the full Drive sweep, so pushing the cassette hard doesn’t require manual compensation downstream.

Tone sits inside the cassette chain as a bipolar tilt EQ pivoting around 1 kHz. Counterclockwise reduces highs and boosts lows; clockwise does the opposite; center is flat. In default routing, Tone lives inside the feedback loop, which means its character accumulates per repeat: a dark Tone setting with high Feedback produces echoes that grow progressively duller with each pass, the same behavior a tape machine produces when the heads are worn. Tone carries frequency-dependent positive gain — a bright Tone setting raises the overall level through the feedback path, so Tone and Feedback need adjustment in tandem rather than independently.

Oversampling applies at the saturator stage at 1x, 2x, or 4x. At high Drive, higher oversampling reduces aliasing artifacts in the saturation harmonics. The tradeoff is CPU; 4x is the highest-quality option and the most expensive to run. On slower systems or sessions with many instances, 1x preserves headroom.

Each Repeat Re-Enters the Cassette Chain

In default routing, the signal path follows the Space Echo model: input → cassette → delay, with the feedback returning from the delay output back into the cassette input. Every repeat enters the full cassette chain again — Drive saturates it again, Tone reshapes it again, Wow and Flutter pitch-modulate it again. Each pass accumulates these processes: a signal that has been through three or four feedback cycles is a different sonic object than the dry input, not just a quieter version of it.

The accumulation affects each parameter differently. Drive accumulation is the dominant character — at high Feedback and moderate Drive, the repeats bloom into a self-saturating wash; the signal transforms as it fades rather than simply declining. Flutter accumulation at high Feedback builds a thick chorused texture from a slow initial wobble, because each re-entry adds modulation at a different phase offset from the previous pass. A dark Tone with high Feedback produces repeats that lose treble with each recirculation, the compounding rate faster than the first pass implies.

The Post-Delay toggle reverses the signal order: input → delay → cassette, with the delay’s feedback returning to its own input untouched by the cassette chain. In this mode, the tape effects apply to the whole signal path — dry input and delay tail both get cassette character — but the repeats don’t accumulate additional processing on each pass. The character you dial in on the first pass stays consistent across subsequent echoes, which is how every other tape-delay plugin routes.

When Post-Delay is off, the Delay button acts as an input switch for the delay line. Turning Delay off prevents new audio from entering the loop while existing echoes continue to recirculate and fade through the full cassette chain. Turning it back on allows new material in. The function is absent in Post-Delay mode, where the delay always receives signal.

Per-Channel Flutter Accumulates Across Repeats

Wow and Flutter address the cassette’s two distinct pitch modulation mechanisms separately. Wow is the slow, low-frequency drift from capstan and reel irregularities — pitch movement that registers as gradual wandering rather than vibrato. Flutter is faster modulation from motor cogging, head-to-tape friction, and reel imbalance — the wavering, warbling quality. Both run from dedicated LFOs with noise components layered in, producing organic irregularity rather than periodic oscillation.

Both Wow and Flutter run per-channel. Each stereo channel carries its own modulation instance, producing the left-right divergence of a real cassette deck rather than a mono wobble spread across the image. The stereo width from this mechanism is subtle at low settings and becomes a meaningful part of the imaging at higher values, particularly on sources that were already stereo before the cassette chain.

At high Feedback, Flutter accumulates across repeats. Each echo re-enters the cassette chain and gets modulated at the LFO’s current phase position. After several passes the cumulative modulation builds a thick chorused texture from what started as light jitter — not a chorus effect added in parallel, but a consequence of the feedback topology that only develops where enough repeats recirculate to let the modulation compound.

The splice system simulates a tape loop’s physical splice passing over the play head. Four controls: Time sets event rate from one occurrence every half-second to one per minute, with knob travel packed toward the fast end where it functions rhythmically; Depth sets severity; Pitch toggle adds a brief pitch chirp per event; Amp toggle adds the level dip. Both toggles can run simultaneously for the full dropout character. Pitch only at low Depth reads as a subtle tape quirk; both at maximum Depth produces a pronounced signal dropout per event.

Noise Enters Before Drive, Not After

Nine noise voices with distinct spectral and temporal characters. Hiss is broadband with high-frequency emphasis — tape hiss at normal bias. Crackle is randomly timed impulse events of varying amplitude, vinyl surface character. Dust is sparse amplitude dropouts triggered randomly, simulating magnetic particles between tape and head. Fan Rumble is low-frequency noise with slow amplitude variation, mechanical rather than electronic in origin. 60 Hz and 50 Hz Hum cover mains interference at their respective regional standards, with harmonic content above the fundamental. White is spectrally flat and brighter than Hiss. Pink rolls off at roughly 3 dB per octave, perceptually neutral. Card Reader is Traverse’s signature voice: a mix of hiss and intermittent high-frequency transients drawn from the character of magnetic stripe contact-head devices.

Every noise voice routes into the cassette input path before Drive. It gets shaped by the Drive saturation model, filtered by Tone, pitch-modulated by Wow and Flutter, and fed into the delay feedback loop. Noise at high Feedback is not a static floor — it builds with each pass, compounding in the loop at the same rate as the signal. A low Noise setting with high Feedback can produce a noise floor that grows noticeably over several repeats because the loop accumulates it.

When Gated is on, the noise level drops approximately 20 dB whenever the input falls below roughly -40 dB. The gate uses fast attack and slower release, following the signal’s envelope rather than chopping. Noise rises with each phrase and falls back in the gaps. At lower Noise settings this makes the effect read as part of the recording environment; at higher settings, Gated is often the difference between a noise floor that complements the signal and one that fills the mix when the instrument stops.

The routing of noise through the cassette chain rather than to a parallel output means noise character changes with every Drive and Tone adjustment. Pushing Drive harder saturates the noise alongside the signal. Brightening Tone affects the hiss character alongside the echo tails. The noise and the signal age through the chain together.

Time Change Moves the Pitch, Not Just the Grid

In free mode, delay Time covers 20 ms to 10 seconds, with most of the knob’s travel concentrated in the sub-2-second range. Changing Time while audio plays produces a Doppler-style pitch shift: pitch rises as Time shortens, drops as Time lengthens, as the simulated read head repositions. This is tape echo machine behavior, not a processing artifact that can be bypassed. Time changes made while the delay is running and the session is being monitored should account for that pitch movement — it can be musical or disruptive depending on context.

With Sync on, Time snaps to host-tempo divisions from 1/32 through 2/1, including dotted and triplet variants. Transitions between free and synced modes are smooth; switching may produce a brief pitch fluctuation as the time recalculates but doesn’t produce a click. Tempo changes from the host update the delay time automatically without user intervention.

Feedback is ceiling-limited: the loop cannot grow uncontrolled even at maximum Drive. At maximum Feedback, the plugin sustains the loop indefinitely or grows slowly, depending on Drive, Tone, and input signal characteristics — it approaches self-oscillation without crossing into uncontrolled output growth. Width requires Feedback to become effective. At minimal Feedback there are few echoes to spread and the stereo image effect is minimal; as Feedback increases and echoes accumulate, the hard-panning and cross-feed of full Width become pronounced.

The Delay button — visible and functional only when Post-Delay is off — acts as an input switch for the delay line. Turning it off stops new audio from entering while existing echoes recirculate and fade through the full cassette chain. Turning it back on injects new material into whatever the loop has become. The function allows looping of a specific sonic moment without new input interfering — stop the input, let the loop breathe through a phrase, re-open when the arrangement moves.

Mix Has No Path Between Cassette and Delay

Mix controls dry/wet balance across the entire signal — cassette processing and delay together, with no independent level control for either. At fully wet, the full processed signal is audible with no dry. At partial Mix, the dry input blends with everything downstream of it. Isolating cassette character without delay, or delay without cassette character, requires either Post-Delay mode with specific parameter choices or a separate parallel routing outside the plugin.

Mix Lock excludes the Mix value from preset loading. When locked, loading a new preset changes every parameter except Mix, which holds wherever you set it. This is the practical solution for sessions where the wet/dry balance belongs to the track rather than the preset — auditioning different tonal or modulation characters without the level jumping between each. The padlock switch next to the Mix knob toggles it; the default is unlocked.

In Post-Delay mode, the Delay button is absent. That control — which stops new audio from entering the delay loop while old echoes recirculate — is only relevant to the default routing where the cassette chain is in the feedback path. Post-Delay mode also changes the scope of Tone’s cumulative behavior: in default mode, Tone’s character accumulates per repeat; in Post-Delay mode, Tone applies uniformly to all signal without that compounding. The two modes have different operational characters at high Feedback, not just different routing diagrams.

Width’s effective range depends on Feedback. At low or zero Feedback, few echoes exist to be spread, and Width has little signal to work with — the stereo-image widening is minimal regardless of the Width setting. Producers expecting Width to function as a general stereo widener on the dry input will find it behaves predictably only when Feedback is high enough to build a population of echoes.

FAQs