an interesting offering for the PI.
there are a few details available here: http://blokas.io (beta testers wanted)
seems to basically be an audio interface + midi, connected to the PI via SPI, this is then exposed as an alsa device to linux. though there seems to be some support for 'auto starting' a pure data patch of the USB drive.
code is open source
doesn't seem to offer a real time OS (unlike Axoloti and Bela), so Id assume it could face jitter.
but nice too see more 'support' for musicians on the PI, they seem to be 'targeting' Pure Data, but presumably if its Alsa, its going to work with anything.