Sidecar is in public testing. Each feature below is marked:
hardware : checked on a real Rytm MKII with the Sidecar attached;in testing : built and tested in the emulator or the simulator, or on the Sidecar alone, not yet confirmed with a real Rytm;planned : on the roadmap .
This is Sidecar 0.1.0 . The Rytm builds are rui1027d (the default: the mods plus the remote pages, the connect screen and the FX return on IN L/R) and sfx1021 (the mods without the remote pages).
The first version is based on Analog Rytm MKII OS 1.73. OS 1.74 will be supported after testing. Marks dated 2026-10-18 come from the test line on a real Rytm; other “hardware” marks from the 1017 to 1022 builds of the same line. Keep the stock OS file at hand: flashing it takes you back. Where things are stored: the send FX settings and the Sidecar machine choices are in the Rytm’s kit; the Sidecar’s per-project and per-kit files (slot lists, sample pool, JUNO / FM lists, LFOs) are on the Sidecar’s card. Back on the stock OS your projects still load: the send FX values are ignored and tracks on Sidecar machines show them as missing.
Feature
Status
EXT machines PLAITS, DAISYSP, DSP SAMPLE, DIGIDRUM, JUNO, 6-OP FM on every track
hardware
Each voice returns on its own track and plays through the track’s analog filter and amp
hardware
SEND FX 1/2 pages: AMPLITUDE 2 sends, TYPE, P1 ROUTE (PRE/POST), P2..P5 with the effect’s labels, stepped lists
hardware
CHORUS, COMB, CRUSH, RINGMOD send effects
hardware
HALO plate reverb (DCY with FREEZE, MOD, TONE, SHIM)
hardware (2026-10-18: heard; on the Mini about 5.7 % CPU per slot)
The SIDECAR folder in the sample browser, LOAD TO PROJ into the Sidecar’s sample pool
hardware
User machines in slots U1..U5, slot fingerprints, slot reasons on the Rytm (!ROOM, !CRSH, !TIME)
hardware
LFOs: 8 on the Pi, 4 on the Mini, on voice parameters and FX P2..P5, saved per kit
in testing
DSP SAMPLE’s MOD as a stepped list (ONE LOOP SLICE GRAIN STRCH PLUCK WAVE)
in testing
Voices released and FX tails cleared on every reconnect
in testing
Double stop fades the Sidecar’s effect tails
hardware
Feature
Status
Remote pages on the Rytm’s screen (TRK + YES) in the Rytm’s own font, on the Pi and the Mini
hardware
Status pages SIDECAR + SYSTEM (they catch every knob)
hardware (2026-10-18)
Key pass-through: PLAY / STOP / RECORD, pads, mutes, FILL and tap tempo reach the Rytm on a page
hardware (2026-10-18)
Connect screen when the Sidecar comes up
hardware (2026-10-18)
SCOPE and meters
hardware (2026-10-18)
REC page: arm, record, stop (Pi and Mini)
hardware (2026-10-18)
Playback on the REC page (Pi)
hardware (2026-10-18; one glitch when picking takes with C, being fixed)
Machine pages only for tracks on a Sidecar machine, shown on the SRC page (not in the TRK + YES list) with rui1027d; they follow a machine change at once
hardware (2026-10-19)
DSP SAMPLE waveform page, machine graphics (FM algorithm, JUNO envelope, GRAIN’s cloud)
in testing
SRC view (rui1027d): the Sidecar’s machine page on the Rytm’s own SRC page, every key and knob the Rytm’s, also after a USB replug
hardware (2026-10-19)
Voice pages named by track (BD, SD, …), meters and SCOPE in track order, JUNO pages per track, PAT presets
hardware (Pi)
LFO page (TRK + LFO) with the DESIGN view
in testing
REC page: the trig keys pick the recorded channels (Pi)
in testing
NO on SIDECAR leaves; unused user-machine knobs as hatched boxes on the Rytm’s SRC / SMPL pages; preset names at once
in testing
FX return on IN L/R: recorder files FX_L / FX_R, SCOPE source FX
hardware (2026-10-18, SCOPE on the Mini)
Feature
Status
RINGS, CLOUDSEED and STUTTER send effects
hardware
Multitrack recorder to the SD card (up to 23 sources)
hardware
Web page at http://sidecar.local, with choice buttons that show the device’s state
hardware
Sample pool and presets per project, the Pool & presets page
hardware
File browser with folder upload, also large sample folders
hardware
Unplugging and replugging the USB cable to the Rytm; restarting the Rytm or the Pi
hardware (after many replugs the Pi may need a restart: known issue, fix planned)
5” HDMI touch display; hide the touch test; brightness down to 5 %
hardware
DSI touchscreens: the official 7” display (v1) and compatibles such as the OSOYOO 7” DSI V4.0
expected, being confirmed (Touch Display 2: not supported)
Boots from its own SD card, also from a cold power cycle
hardware
Computer audio and MIDI over USB-C: no clicks at the stream’s start, 5 minutes clean
hardware (2026-10-19)
Wi-Fi: join a network
hardware (joins on the first boot; off in the package)
Wi-Fi settings on the web page (scan, connect and save, 90 s fallback; the Pi restarts on a join) and first setup from sidecar-wifi.txt on the card
in testing (implemented, not yet run on hardware)
Feature
Status
Runs on a stock board, no PSRAM needed (except GRAIN and stems)
hardware
Recorder, stereo, with a fast card (24-bit 70.8 s and 16-bit 62.4 s, 0 drops)
hardware (2026-10-18)
Web console: status, sound, record, user machines, files; choice buttons that show the device’s state
hardware
“Sidecar Mini” as its USB name
hardware
Smaller NoisePlethora packages
hardware
PSRAM: a second plugin code space for more and bigger user machines
in testing (testers with PSRAM)
Recorder stems with PSRAM
in testing
Computer audio: stereo USB audio to the computer
hardware (heard in a DAW); paused while the recorder runs without PSRAM; multichannel later
USB MIDI to the computer
in testing
For what does not work yet, see Troubleshooting and known issues .