eurim

I've imported a song into 3MLE and noticed I have many tracks that seem empty. For example, I have one track with a just this line /*M 43 */ v7>g32 preceded by many lines of rest. Also there are MANY other tracks that looks like this //#using_extension //#using_channel = 13 // or whatever target track I'm importing /*M 0 */ r2.r16y64,0y72,64 In fact I think all the target tracks besides the first one (channel 1) has only this line. Should I keep these or discard them? What do the "y", "v", ".", and "," represent? How do I interpret these lines? Also what exactly does the quantization setting do?