PF · 002 · Grainsmith FieldController setupBack to Grainsmith Field

Hardwarecontrollers.

Three controllers, working out of the box.

Grainsmith Field listens for standard MIDI CC messages. The OXI E16, MIDI Fighter Twister, and Roto-Control each have a ready-to-load preset file. All three require one-time configuration in each controller’s desktop editor, then work immediately with no in-app mapping step.

All three controllers use 7-bit absolute CC mode (values 0–127). Encoder pushes reset the mapped parameter to its default where noted.

SupportedOXI E16 · MIDI Fighter Twister · Roto-Control

CC type7-bit absolute (0–127) on all three

Preset filesOXI E16 (.oxie16) · MIDI Fighter Twister (.mfs) · Roto-Control (.json)

01 · OXI E16

16 encoders, two pages.

The E16 covers all 19 mappable parameters across two pages. Load the preset file into the OXI app, copy the device profile, and the E16 works immediately as the default controller profile in Grainsmith Field.

Page 1 — PerformChannel 5 · CC 0–15 · 7-bit absolute

EncoderCCParameterEnc 10PositionEnc 21Grain SizeEnc 32DensityEnc 43SpreadEnc 54SpeedEnc 65JitterEnc 76PitchEnc 87MorphEnc 98Pitch RandomEnc 109ReverseEnc 1110Wet MixEnc 1211Scan DepthEnc 1312Reverb MixEnc 1413Reverb SpaceEnc 1514Filter CutoffEnc 1615Resonance

Page 2 — Sound / FXChannel 5 · CC 16–18 · 7-bit absolute

EncoderCCParameterEnc 116Grain ShapeEnc 217FreezeEnc 318Level

02 · MIDI Fighter Twister

16 encoders, full parameter set.

Import the preset into MIDI Fighter Utility, send it to the device, and leave the in-app controller profile on its default (OXI E16) — no profile change needed. The MFT works immediately.

Bank 1Channel 5 · CC 0–15 · 7-bit absolute · Push = reset

EncoderCCParameterEnc 10PositionEnc 21SizeEnc 32DensityEnc 43SpreadEnc 54SpeedEnc 65JitterEnc 76PitchEnc 87MorphEnc 98Pitch RandomEnc 109ReverseEnc 1110Wet MixEnc 1211Scan DepthEnc 1312Reverb MixEnc 1413Reverb SpaceEnc 1514CutoffEnc 1615Resonance

03 · Roto-Control

18 knobs, four buttons.

Import the preset in the Melbourne Roto Control app on Mac or PC and all 18 knobs lay out across three pages. Map the four buttons by hand for transport and performance. Works against the default profile with no in-app selection required.

One-time setup in the Roto Control app:

Import Grainsmith.json into the Roto Control app — it sets up all 18 knobs across pages 1–3 in one shot.
Map the four Page-1 buttons by hand from the Buttons table below (the file has no buttons yet): momentary, CC 40–43, channel 1.
Confirm every encoder is absolute CC, 7-bit. In Grainsmith Field, the Roto works against the default profile — no change needed.

CC modeAbsolute CC, 7-bit (0–127)

ChannelChannel 1 · knobs and buttons

ButtonsMomentary · CC 40–43 · mapped by hand

Push / resetNone — knob click has no in-app effect

Critical: set encoders to absolute CC, 7-bit — not relative and not 14-bit. Relative or hi-res mode will cause the parameter to jump or wrap unpredictably.

The app echoes parameter changes back on the mapped CCs, so the Roto’s motorized knobs may track in-app edits automatically.

Page 1 comes from a known-good export shared by mistercharlieon the Loopy Pro forum. Pages 2–3 and the buttons extend it in the same format, straight from the app’s shipping mapping table, so the assignments are correct by construction; the extended pages and button feel are still gathering hardware confirms.

Download Grainsmith.json

Page 1Channel 1 · CC 1–8 · 7-bit absolute

KnobCCParameterKnob 11SizeKnob 22DensityKnob 33JitterKnob 44PositionKnob 55Reverb MixKnob 66Reverb SpaceKnob 77CutoffKnob 88Pitch Random

Page 2Channel 1 · CC 9–16 · 7-bit absolute

KnobCCParameterKnob 19SpreadKnob 210SpeedKnob 311PitchKnob 412MorphKnob 513ReverseKnob 614Wet MixKnob 715Scan DepthKnob 816Resonance

Page 3Channel 1 · CC 17–18 · 7-bit absolute

KnobCCParameterKnob 117Grain ShapeKnob 218Level

ButtonsChannel 1 · CC 40–43 · momentary

ButtonCCActionButton 140Play / StopButton 241Freeze (toggle)Button 342Grain Shape (cycle Soft → Round → Sharp)Button 443Record (toggle)

Any CC controller

Not on the list?

How it worksGrainsmith Field responds to any MIDI CC on any channel. The tables above are pre-built mappings; you can use them as a reference for any encoder surface that lets you set CC numbers.

ChannelThe app listens on channels 1, 5, and 6 by default. Match whatever channel your controller sends on, or use MIDI-learn to remap in-app.

CC typeUse 7-bit absolute mode (values 0–127) for predictable behavior. Relative and 14-bit hi-res modes are not currently supported.

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