For each channel a SCCB (Sound Channel Control Block) is maintained by the channel handler. The first 9 words are usually stored in R0-R8.
Offset Value
0 gate bit, channel amplitude (7 bit log)
1 voice table index
2 attached voice instance number
3 control/status flags
4 phase accumulator pitch oscillator
8 phase accumulator timbre oscillator
12 counter of remaining buffer fills
16 working R4
20 working R5
24 working R6
28 working R7
32 working R8
36-63 reserved for future expansion
64-255 for user use
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