Adjusts the loop status of the specified voice. This can be done while
the voice is playing, so you can start a sample in looped mode (having
set the loop start and end positions to the appropriate values), and then
clear the loop flag when you want to end the sound, which will cause it
to continue past the loop end, play the subsequent part of the sample,
and finish in the normal way. The mode parameter is a bitfield containing
the following values:
Plays the sample a single time. This is the default if you dont set
the loop flag.
Loops repeatedly through the sample, jumping back to the loop start
position upon reaching the loop end.
Plays the sample from beginning to end. This is the default if you
dont set the backward flag.
Reverses the direction of the sample. If you combine this with the
loop flag, the sample jumps to the loop end position upon reaching the
loop start (ie. you do not need to reverse the loop start and end
values when you play the sample in reverse).
When used in combination with the loop flag, causes the sample to
change direction each time it reaches one of the loop points, so it
alternates between playing forwards and in reverse.