Modulation routes

Modulation in VXN1 is organised by destination: each routable destination is its own panel with source selectors and depth knobs. There is no matrix. Every route on this page is always live — no routing menus, no slots to assign.

Pitch modulation

Routes to both oscillators by default (vibrato, pitch envelope, pitch wheel). The two Mod switches turn either route into a single-oscillator route to drive the cross-mod modulator without moving the carrier — which is how VXN1 implements wide cross-mod sweeps.

• Pitch LFO — source: Off / LFO 1 / LFO 2.
• Pitch LFO Dep (0–12 st, exp taper) — vibrato depth.
• Pitch LFO Mod — when on, the LFO contribution is routed only to the cross-mod modulator oscillator. Under Sync, that’s Osc 1 (the slave). Under PM / Ring / Off, that’s Osc 2 (whose output modulates Osc 1). When off, the LFO route moves both oscillators together (normal vibrato).
• Pitch Env — source: Off / Env 1 / Env 2.
• Pitch Env Dep (−12 to +12 st) — envelope-driven pitch sweep. Negative inverts.
• Pitch Env Mod — same single-oscillator routing as the LFO Mod switch. With Mod on and a wide envelope depth (use the ±12 st range), this is the standard way to drive a classic sync sweep or a swept PM index.
• Pitch Wheel (0–12 st) — pitch-bend range from MIDI pitch wheel. Always applies to both oscillators.

The Mod switches and the Cross-Mod Sweep mod-wheel route below are the only routes that target one oscillator without the other. All other pitch routing moves both osc together.

PWM modulation

Routes to Osc 1 and Osc 2 pulse widths simultaneously (so PWM only affects oscillators currently set to Pulse).

• PWM LFO — source: Off / LFO 1 / LFO 2.
• PWM LFO Dep (0 to 0.5) — sweep depth (0.25 = full ±25% PW excursion).
• PWM Env — source: Off / Env 1 / Env 2.
• PWM Env Dep (−0.5 to +0.5) — envelope depth, can invert.

Static PW from each oscillator’s PW knob is the centre point; modulation displaces from there.

Filter modulation

Four fixed depths, no source selectors. Every depth knob is live simultaneously; set unused routes to zero. The envelope route is hardwired to Env 1.

• Cutoff LFO1 Dep (0–48 st) — LFO 1 → cutoff.
• Cutoff LFO2 Dep (0–48 st) — LFO 2 → cutoff.
• Cutoff Env Dep (−96 to +96 st) — Env 1 → cutoff (source is fixed; not selectable). Negative closes the filter on note-on.
• Vel→Cutoff (−96 to +96 st) — MIDI velocity → cutoff.

The 96-semitone range gives enough headroom to fully sweep from minimum to maximum cutoff via velocity alone — useful for dynamic playing where soft notes are dark and hard notes are bright.

Key tracking is a separate continuous depth on the Filter panel, not a modulation depth on this panel.

Cross-Mod Sweep (mod-wheel)

VXN1 has no dedicated cross-mod sweep envelope route. Instead:

• Envelope-driven sweeps are built by enabling the Mod switch on the Pitch Env route (above). With Mod on, the pitch envelope drives only the cross-mod modulator (Osc 1 in Sync mode; Osc 2 in PM / Ring / Off). Use the full ±12 st depth for dramatic sweeps; combine with Osc 2 detune to shift the sweep range.
• Wheel-driven sweeps are the Wheel→X-Mod knob in the Mod Wheel panel below, which gives ±48 st of wide pitch range. Unlike the Mod-switched routes, the wheel route is always both-osc — under Sync and Ring it shifts both oscillators in parallel; under PM the modulator’s pitch dominates the audible result.

The wheel route is not gated by Cross-Mod Type — turning Cross-Mod Type to Off doesn’t disable it. With Off or Ring it acts as a wide pitch joystick.

Mod Wheel routes

The Mod Wheel (MIDI CC1) has four fixed destinations. Set any to zero to disable that route.

• Wheel→PWM (−0.5 to +0.5) — pulse-width depth.
• Wheel→Cutoff (−96 to +96 st) — cutoff depth.
• Wheel→Reso (0–1) — adds to resonance.
• Wheel→X-Mod (−48 to +48 st) — wide pitch route; used as the cross-mod sweep when Cross-Mod Type is Sync or PM.

The Mod Wheel CC is smoothed with a 40 ms time constant at control rate, so jitter from cheap controllers won’t transmit into the audio.

Parameter summary