=> R0 = new sequence position (0-127), -1 to read current position
R1 = new event position (0-63), -1 to read
<= R0 = previous sequence position (0-127)
R1 = previous event position (0-63)
This SWI can be used to read or alter the current sequence or event position in the current song.
V flag set if no song is loaded or the position/event number is out of range
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