Most Pd examples we have use the stereo I/O on [adc~ 1 2] and [dac~ 1 2] . When you have the multichannel expander, [adc~ 1 2 3 4 5 6 7 8] and [dac~ 1 2 3 4 5 6 7 8] are the audio I/O. Analog inputs start at 9 ([adc~ 9 10 11 12 13 14 15 16]) and digital channels follow (17 through 32). Finally, the Bela scope is on [dac~ 33 34 35 36].
We'll make sure we highlight this in the documentation.
