Tried the PiPedal on a Pi 5 with a Hifiberry DAC+ but it didn't want to know - not sure why, as I did the correct config amendments and it shows up in aplay. However, from the discussion forum it looks like USB interfaces are the recommended way forward, so I've decided not to waste any more of my life on that - it'll get put to other purposes. I've got a Presonus Studio 24c incoming to play with so I don't have to start unwiring the other USB interfaces I have littering the house. More news next week sometime.