Built-in modules

What each rack slot type does and how it connects to the rest of the patch.

Expanded module panels: keyboard, controls, and slot headers in the rack — Typical slot panels — SoundFont keyboard, knobs, channel badges, and per-slot actions vary by module type.

GrooveForge Keyboard

Multi-timbral SoundFont (.sf2) engine with up to 16 MIDI channels per slot, per-channel bank/program, optional per-slot vocoder, and gesture actions on the on-screen keys. Wire MIDI IN from hardware or from Virtual Piano / Looper; audio OUT goes to the master bus or other effects via patch cables.

Virtual Piano

Touch keyboard with no internal sound — it only forwards MIDI through its jacks. Ideal ahead of a SoundFont or VST instrument. Connect Scale IN from Jam Mode for highlighted scale degrees and snapping.

Vocoder (GFPA)

Dedicated slot with carrier waveforms (saw, square, choral, natural/PSOLA), MIDI pitch bend and vibrato (CC1), and microphone modulation. Multiple vocoder slots can coexist.

Stylophone & Theremin

Monophonic Stylophone strip and Theremin pad with MIDI OUT to the rest of the rack. Theremin supports CAM mode on some platforms (motion via front camera — see privacy policy).

Jam Mode

Single-instance processor: choose a master channel; when the master plays chords or bass (configurable), target keyboards and vocoders lock to the derived scale. Includes scale type, BPM-aligned root updates, and optional pin strip under the transport. Pairs with Virtual Piano Scale IN or internal scale lock on keyboards.

MIDI Looper

Multi-track MIDI recorder/looper with overdub, per-track mute, reverse, speed, and quantisation. MIDI IN can be any upstream source; MIDI OUT feeds instruments. State is stored inside .gf projects.

Drum Generator

Transport-synced drum machine driven by .gfdrum pattern files: step grids, humanisation, swing, fills, and optional count-in. Uses General MIDI drum notes on the configured SoundFont.

Autotune

Pitch correction for a voice or any single-note line. Patch Live Input into it: it hears the note you sing and pulls it onto the nearest note of the chosen key and scale — or of a scale patched in from Xen or Jam Mode. Retune sets how fast: 0 ms is the stepped robot sound, 50 ms and up just sounds in tune. Strength sets how far, Humanize lets held notes keep their vibrato, Flex-Tune leaves slides and blue notes alone, and Transpose goes from monster to chipmunk. A live readout shows the note you sing, how many cents off it is, and where it is being pulled.

Descriptor effects & MIDI FX

Bundled .gfpd plugins provide reverb, delay, wah, EQ, compressor, chorus, audio harmonizer, autotune (audio) and harmonizer, arpeggiator, transposer, chord expand, velocity curve, gate (MIDI). Custom descriptors can be loaded from disk.

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