Is there a batch extraction tool or something like that? Tell me if you know.
- Start playing the music and pause while the target DPCM is sounding.
- Calculate the DPCM offset and size from $4012/3 register values. offset = ($4012 << 6) + 0xC000; size = ($4013 << 4) + 1; (Also, see lower-4bits of $4010 if you want to know the sampling rate.)
- Extract DPCM from RAM via memory viewer (save the whole memory image and cut it, if you cannot save the certain area of the memory).
I think the steps above can be scripted in 2018. We probably should!