I have successfully got the PCM audio example working: http://playground.arduino.cc/Code/PCMAudio
However I want to use the SPI library to control a MCP23S17 (16bit I/O expander). http://arduino.cc/en/Reference/SPI
The SPI library has to use pins 10,11,12 & 13 to connect to the MCP23S17. However, the PCM audio example also outputs on pin 11. Does anyone have a link to a reference table for all the constants used in the PCM example to setup the registers (e.g. COM2A1, COM2A0 etc).
Am I correct in thinking that if I change these constants, I should be able to use one of the PCM pins lower down the board (pin 3,5 or 6) instead of 11?