Sidecar Mini | Expander

not connected

This page needs WebSerial: use Chrome or Edge on a desktop, opened from localhost or https.

Status

cpu - % · peak - % · underruns - · ob - · fifo - (min - max - target -) · xruns - · notes - (- channel mask -) · out -

From the Teensy's 2-second stats lines (hidden in the log unless you show them there).

Sound

MIDI notes

Output

IN L/R source

Computer audio

Machine

FIFO target

Output and FIFO are the USB host build's; the serial build answers them with a note.

LFOs

Four LFOs on the Sidecar's voices (V1..V8: any parameter) or its send FX (FX1 / FX2 P2..P5), on top of the Rytm's value; the value comes back when the LFO stops. Saved per kit, as the Rytm's own LFOs (switched with the Rytm's kit); the same on the Rytm's LFO page (TRK + YES).

Record

0:00:00

Start and stop

Channels

Bit depth

Take name _001, _002, ... in /Recordings

Recording without PSRAM needs a fast SD card (A1/A2, U3/V30 class): the Teensy's own buffer holds only 57 ms of 24-bit stereo (85 ms at 16-bit). On a slower card, or if "the card fell behind" shows, record 16-bit.

Levels

The peak of the last half second while armed or recording, on the channels the take records. One WAV a channel (MASTER as a stereo file), all starting on the same frame and the same length, so they line up in a DAW; the same layout as the Sidecar (Pi). The takes are in Files, /Recordings.

USB

Stereo: the Sidecar Mini is also a 2 in / 2 out USB audio interface on this port, 48 kHz. The computer records the Rytm's MAIN L/R (with the Sidecar's voices as the Rytm plays them), and what it plays goes to the Rytm's MAIN input. A change re-enumerates the Teensy (the page reconnects by itself); the Rytm keeps streaming. The mode is kept across reboots. Multi (20 in / 12 out + MIDI) is the teensy/host_uac2.sh build.

Audio mode

Computer-

CardBrowse the SD card

Disk mode

USB disk mode (the card as a disk on the computer, faster than the browser) is not in this firmware yet. When it comes, the computer's audio and MIDI to the Teensy stop until you switch back. The Rytm side keeps running. Until then, use the card browser (Files).

User machines

Machine	Version	Package	Code RAM	State / voice	CPU / voice	API	Slots	Fit

Drop .rmp packages here to install, or choose files. A package that will not fit is refused before it is sent. Installing writes the Teensy's flash: only with the Rytm's transport stopped.

Memory

Connect to read the Teensy's memory map.

SD card

hidden files

	Name	Size	Modified
	Connect to browse the card.

Drop files or folders here to upload to this folder, or choose files or a folder (with its subfolders; .DS_Store and ._ files are left out).

Transfers run in the Teensy's idle time, one card operation per loop pass. Writes, deletes and renames wait while the Rytm's transport runs; reads go on, slowed down. New samples in /Samples show in the Rytm's browser after a reboot (the card index).

Log & console

replies periodic stats

About

Version - (read from the Teensy: the version console command)

Sidecar Mini | Expander (Teensy 4.1), over WebSerial. Chrome or Edge on a desktop; ?mock runs against a fake device.

The page talks to the Teensy's console (: lines) and its web console frames (docs/webui-protocol.md). Card writes and installs wait while the Rytm's transport runs.