First task is to design an 8 channel audio out board based on the Cirius CS42448.

Schematic

Data sheet

don’t need any inputs. 

Need to look at output scaling for Eurorack and line level. 

Think initially I will make a pcb that a teensy can connect to directly, but eventually I may add the circuitry directly to the drum machine pcb. 

Realising that I need to build this for Teensy 4.0 / 4.1 as other models are not available. This means less Ain pins but will have to do the multiplexing idea.