=> R0 = -1 then if R1 <>-1 play pattern R1
if R1 = -1 play normal
other, -1 then play patterns from R0 to R1
R2 = -1 to not loop at end
other, -1 to loop
The pattern pos is set to 0. In the case of playing a part of the sequence, the current position is set to the first pos in that part.
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