Sequencer using a drum loop

I am working on a project where I am trying to make a drum sequencer that uses a drum loop (.wav format) as the samples. I currently have the patch at the point where it loads a audio loop, works out the bpm of the loop and I also have a simple 16 step sequencer.

I have attached the patcher so far.

I can't figure out how to make it play back short parts of the loop with silence in between each hit or slice of audio, can you help?