Changelog

What changed in each release.

0.7.2 (7 November 2026)

Built on DOOM OS 0.7.3 (build 733D) for Roland firmware 5.52. The Arp is back in MIDI FX with a new HUMAN setting, Swing is new, and a keyboard plays your MIDI FX wherever you play it.

New

• DOOM OS 0.7.3 underneath, built into the patch as before: patch Roland's 5.52 file. MIDI Conductor 0.7.1 with DOOM OS 0.7.2 stays on the patcher page under Show earlier versions.
• The Arp is in MIDI FX. It plays held notes one at a time: a chord from Harmonize before it, a held step, or pads held down. RATE, MODE (UP, DOWN, UP-DN, DN-UP, ORDER, RANDOM, CHORD), OCTAVE, GATE, REPEAT, LATCH, and a RHYTHM: ALL, one of 22 patterns, or a Euclidean rhythm of 2 to 16 steps with HITS of them played. While the pattern plays it keeps to the pattern's grid and starts from its top every time the pattern loops, and a step as long as the whole pattern keeps it going every bar. LATCH holds the notes you play; a pattern step's notes end with the step. It stops when the pattern stops.
• HUMAN on the Arp's third page: each note's velocity and length move a little, more as you turn it up. It isn't on the CC map.
• Swing, a new MIDI FX. While the pattern plays, every second 1/16 (or 1/8) comes later, from AMOUNT 50 (straight) to 75. Put it last in the chain, so the notes an Arp, Euclid or Echo before it makes swing too.

Changed

• Loop Stretch no longer has a REPEAT setting: switched on, it stretches. A slot saved with REPEAT OFF loads switched off.
• Loop Stretch and Time Elastic with SOURCE CHAIN take the slots before them too, so Harmonize then Loop Stretch stretches the chord.
• PITCH/SPEED on DOOM OS's page reaches DOOM OS when you let go of it, and not at all when you press another key with it. On the mixer, a tap opens the EQ as before, and the gear keys no longer open it.

Fixed

• A keyboard routed to the SP only ran a sample track's or DOOM OS instrument's MIDI FX while rehearsing or recording. It runs them any time now, at the keyboard's pitch.
• A keyboard routed to a synth skipped a MIDI Instrument's MIDI FX until something was recorded on its track.
• The gear keys (PITCH/SPEED + PATTERN EDIT or PATTERN SELECT) did nothing on the MIDI FX screens.

0.7.1 (1 November 2026)

Built on DOOM OS 0.7.2 (build 359C) for Roland firmware 5.52, like 0.7.0. Better for running a rig of synths from the SP.

New

• Program changes per pattern. Each pattern can switch devices 1 to 6 to a program of your choice, with a bank sent as MSB or LSB. They go out when play starts and when the pattern changes, and only to a synth whose program actually changes, so a synth that keeps its program isn't reset. Set them in MIDI SETTINGS > PATTERN > PROGRAM CHANGES.
• MIDI CLOCK setting in the DOOM OS settings tab, under MIDI CONDUCTOR. FOLLOW (the default) starts and stops your gear with the SP. With ALWAYS the clock never stops, so synths and loopers stay in time while the SP is stopped, and you start and stop your gear yourself:
  • PITCH/SPEED + PATTERN EDIT starts or stops your gear on its own: on the next bar while a pattern plays, straight away when the SP is stopped.
  • PITCH/SPEED + PATTERN SELECT starts or stops your gear together with the SP's pattern.
• Pause the routes. Hold SHIFT + REMAIN to stop everything coming in from your routed devices, and hold it again to bring the routes back. Use it when a synth that plays the SP should play only itself for a while.

Changed

• The SP no longer sends a MIDI Start every time the pattern loops, so gear that follows its clock (a looper, a synth's sequencer) runs on instead of jumping back to its start.
• MIDI SETTINGS > PATTERN now has PROGRAM CHANGES and CLEAR AUTOMATION.

Fixed

• MIDI Instrument notes could come out a note or two off (a C played as an A#) depending on the pad. Every pad now starts from C3.
• Euclid on a sample pad with GATE off kept playing after the pattern looped. Its rhythm now ends where the pattern loops and starts fresh when play starts again.
• The Euclid screen's step marker follows that track's own rhythm.

0.7.0 (30 October 2026)

Built on DOOM OS 0.7.2 (build 359C) for Roland firmware 5.52. The biggest release yet: MIDI Instruments, MIDI FX, new device screens and a setup that belongs to each project.

New

• DOOM OS 0.7.2 underneath, with its instrument switching on the fly.
• MIDI Instruments. Pick MIDI in DOOM OS's instrument picker and tap a pad: it plays your synth, gets a track in the pattern, lights blue, and has its own MIDI INSTRUMENT page to choose the synth or a raw channel. This replaces the PADS screen.
• MIDI FX. Six slots on every track, run in order: Harmonize, Echo, Scale, Chance, Randomize, Dispatch, Euclid, Loop Stretch, LFO, ENV and Time Elastic. Open them with PITCH/SPEED + FX1..FX6. The CHAIN page (PITCH/SPEED + RECORD SETTING) switches, reorders and removes effects, and sets each slot's SOURCE (the chain or the pad's own note) so Euclids can layer into polyrhythms.
• MIDI FX on samples and DOOM OS instruments. The same chains work on sample tracks and on DOOM OS's own instruments: repeats, rhythms, chance and, on chromatic pads, chords and scales.
• Euclid TIE. Euclid's GATE goes one past 100%: each hit rings until the next, which suits samples.
• LFO and ENV move a synth's controls, or the SP's mixer and MIDI FX settings, in time with the music. Pick the TARGET from a list with RECORD SETTING.
• New DEVICES screens: channel, name, CC names, INPUT ONLY and USAGE (what uses a device). DEVICES.CSV brings your synths in with their CC names and channels, and exports them again. The patcher page makes one from the synths you pick.
• The CC MAP: map a controller's or a synth's dials to another synth, or to a track's mixer, MIDI FX and EQ, each with a range (backwards to invert).
• GHOST follows DOOM OS's mixer and EQ: level, pan, bus and EQ like a sample track.
• Per project. Devices, routes, CTRLs, MIDI Instruments and MIDI FX belong to each project. Deleting a project deletes its MIDI setup too.
• MIDI Conductor settings in the DOOM OS settings tab: START ANIM, PICKUP and CTRL VIEW (dials or bars).

Changed

• Synths aren't built into the firmware any more. Pick them on the patcher page, download DEVICES.CSV and import it on the SP. Change them at any time without patching again.
• Recording dial moves is now MARK + REC (SHIFT + VALUE goes back to DOOM OS). Holding MARK catches a dial on MIDI Controls, GHOST and MIDI FX.
• Setting a CTRL's synth and control on the MIDI Controls page is RECORD SETTING (MARK is catch).
• MIDI SETTINGS (SHIFT + REMAIN) has DEVICES, ROUTES and PATTERN. Pads are set up as MIDI Instruments instead.
• Device pickers leave out devices with no channel and input-only devices.

Coming from 0.6

Your devices, routes and CTRLs move into the first project the SP starts in. Pads you set on the old PADS screen are cleared after a few seconds: make them again as MIDI Instruments (see the manual). The Arp is left out of MIDI FX in this release while it is reworked.

0.6.5 and earlier

Alpha releases built on DOOM OS 0.6.x (0.6.5: DOOM OS 0.6.2-alpha, build 3824). They can still be patched from Earlier versions on the patcher, and the 0.6.5 manual is kept at releases/0.6.5-alpha/manual.html.