Getting Loops made in waveform objext to play in other groove

Hi-

I'm brand new to MAX and have a lot of trouble following the help and reference files. I'm essentially trying to make a field recording sampler where I can select portions of the waveform to loop, then send that information into a new groove object that gets activated by a keystroke. I can't really figure out how to connect the waveform loop to go into the keystroke thing without making a destructive crop edit. Any suggestions? Sorry if that makes no sense at all.