=> R0 = < -1 disable beat counter, set bar length to 0
-1 read current bar length
0 read current beat number
> 0 enable beat counter, set bar length to R0
<= R0 = (entry R0 = 0) current beat number
else previous bar length
This call sets and reads the beat counter or bar length. When enabled the beat counter counts from 0 to (bar length - 1). Disabling the beat counter causes Sound_QSchedule to schedule relative to the time of the SWI calls.
See PRM 4, page 51.
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