Teensy drum machine

I need to test how complex I can make the Faust code and it still run smoothly on the Teensy, taking into consideration all the other processing that it will need to do.

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.