Source Audio ZIO Bass Preamp — MIDI Editor & CC Reference

Control the Source Audio ZIO Bass Preamp from your browser — MIDI control reference, interactive editor, and AI-generated presets. Free, no install.

Explore the ZIO Bass Preamp controls in your browser and connect compatible MIDI hardware to send settings to your pedal. The reference below shows the controls mapped in Nitelite; available functions depend on the pedal and firmware. The default MIDI channel in Nitelite is 1. Browser MIDI control works in Chrome, Edge, Opera, or Brave — no install required.

Knobs

ControlMIDI CCDescription
OUTPUTCC 14Master volume control. Boost up to +16dB or cut by -6dB. Can be used as a clean boost or as an "underdrive" when set below bypass level.
BASSCC 15Low-end shelving boost centered at 100Hz. Starts flat (no boost) at minimum and boosts bass by up to +11dB at maximum. This is a boost-only control — it cannot cut low frequencies.
TREBLECC 16Active shelving filter at 1kHz. Flat (no boost or cut) at noon. Boosts 1kHz and above by up to +14dB at maximum, cuts by up to -6dB at minimum.
FOCUSCC 17High-pass filter control. Sweeps the bass-cutting filter to higher frequencies as you rotate clockwise, removing more low-end. Works in conjunction with the BASS knob — when BASS is active, FOCUS creates a peaked bass response by pitting a movable HPF against the fixed 100Hz bass boost.

Switches

SwitchMIDI CCPositions
GRITCC 18Off / On
SCOOPCC 19Off / On

Footswitches

  • ON/OFF — CC 102

Special MIDI Functions

  • Expression — CC 100

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