Installing FRIZZ

FRIZZ installs from the SD card, the same way as any CHOMPI firmware update. You don’t need any tools or drivers, and the CHOMPI’s bootloader is never touched.

What you need

• A CHOMPI. It doesn’t matter which firmware it runs now (TAPE, TEMPO or WAVE).
• Its microSD card, or any FAT32-formatted microSD card.
• A computer with a card reader.
• FRIZZ.bin. Download it from the Releases page, or build it yourself as described in firmware/README.md.

Install

1. Back up the card. Copy everything on it to your computer: your samples, presets.json and options.json. FRIZZ doesn’t touch them, but you’ll want them if you go back.
2. Remove the old firmware. Delete every .bin file in the top folder of the card, for example CHOMPI_TAPEv2_0.bin. There must be exactly one .bin on the card. Everything else can stay.
3. Copy FRIZZ.bin to the top folder of the card, not into a subfolder.
4. Eject the card properly, put it in the CHOMPI and switch it on.
5. Wait. A slow rainbow LED pattern means the CHOMPI is writing FRIZZ into its memory. Don’t switch it off while that runs. FRIZZ starts by itself when it’s done.

Leave the card in: FRIZZ keeps its FX scenes on it, in FRIZZ/frizz_scenes.txt, and its master settings (compressor, mono input, MIDI) in FRIZZ/frizz_master.txt; the .bak files next to them are the previous versions, and bug-N.txt are bug reports. FRIZZ creates the FRIZZ folder the first time it starts, and moves a frizz_scenes.txt an older FRIZZ left in the top folder into it. Without a card FRIZZ still runs, but scenes you save are gone at power-off. A later FRIZZ update keeps your scenes as long as that folder stays on the card.

Check that it works

1. Plug a stereo source into the AUX input, and headphones or a mixer into the outputs. (FRIZZ doesn’t use the built-in microphone.)
2. Turn the VOLUME knob. You should hear your source, and the VOLUME LED moves with the level.

If you hear nothing, press VOLUME once and turn it to raise the input gain. Press it twice more to get back to output volume. The quick guide takes it from here.

Updating FRIZZ

Same as installing: replace FRIZZ.bin on the card with the new one and switch on.

With the multi-firmware launcher

sfaber02’s fork of CHOMPI has a launcher that keeps several firmwares on one card and lets you pick one with a white key at power-on. FRIZZ works as one of them:

1. Set up the card as that fork describes, with the launcher’s CHOMPI.bin as the only .bin in the top folder.
2. Copy FRIZZ.bin into the FIRMWARE folder, named after the key you want it on, for example FIRMWARE/04_FRIZZ.bin for the 4th white key.
3. Copy your FRIZZ folder over too, if you have scenes from another card. Otherwise FRIZZ creates it on its first start and keeps its scenes there, apart from the other firmwares’ files.

With the launcher, the CHOMPI goes back to its picker every time you switch it on. A FRIZZ update is a new FIRMWARE/04_FRIZZ.bin; no rainbow pattern, since the launcher stays installed.

Going back to stock firmware

1. Delete FRIZZ.bin from the card.
2. Copy back your backup, or a factory card from reference/firmware/card-profiles/ (also in CHOMPI Club’s repo): tape-2.0/, tempo-1.0/ or wave-1.0/. Copy the folder’s contents to the top folder of the card. Each one includes its firmware .bin.
3. Switch on and wait for the rainbow pattern to finish.

Troubleshooting

Problem	Fix
No rainbow, the old firmware starts	Check that FRIZZ.bin is in the top folder, that it’s the only .bin there, and that the card is FAT32
Rainbow, but then nothing works	Copy FRIZZ.bin to the card again (the copy may be damaged) and switch on again
Silence	Check the input gain (press VOLUME, then turn) and the input/loop mix (SHIFT + turn VOLUME, turn towards green)
The CHOMPI doesn’t respond at all	The bootloader may be damaged. Reinstall CHOMPI’s own bootloader (firmware/bin/CHOMPI_Bootloader_V6_2_0.bin) as described in firmware/README.md, then install FRIZZ again. Don’t install the generic Daisy bootloader instead