two effects for convenience and .ftm import:
- 1Axx: set wave load and play pos (equivalent to 11xx 15xx)
- 1Bxx: set wave load and play length (equivalent to 12xx 16xx)
*** Developer Information ***
a small change to the command stream format has been made. the commands for N163 loadpos/loadlen have been retired, and the commands for N163 wave position/length now take in 2 bytes instead of 1.
the first byte is the position/length.
the second byte is a bitset. if bit 0 is set, update playback state. if bit 1 is set, update load state.
2da316b346
