What is the smallest unit of zynthian compute?

How much zynth can you fit on something like this, do you think? Asking for a friend.

That module doesn’t provide GPIO Pin access, so you might be limited to a high latency USB Audio Codec, anything other than USB MIDI might be tricky too.

A custom board ibcluding the Zyithian essentials would be best. That board appears to have space enough for an added consumer grade audio In/Out Codec and DIN Midi circuitry. Here’s an example board with built in Codec.

One of the smaller compute module hosts is shown here.

They are gpios, but I haven’t check yet if I2S and uart interfaces are available.