Should this just work - loopplayer

I have been looking at Glen Rhodes MixerSequencer.fla and I tried to change it from a multi mp3 file player into a multi loop player by changing this

mc.s.start((bar * msPerBar) / 1000);

to this

mc.s.start((bar * msPerBar) / 1000, 99);

after this is declared
tempoBPM = 94.25;
msPerBar = 240000 / tempoBPM;

Should this just work?