MidiLoops is a midi implementation of Tape Loops. It was made specifically to avoid working with audio files in Pure Data and instead use an external sampler to load audio without interruptions. MidiLoops is much more flexible than the audio approach, since each module can trigger several notes.

Currently this is one of my main tools for soundscape performance.

http://www.louigiverona.ru/?page=projects&s=software&t=puredata&a=puredata_midiloops

An example of this patch in action - the notes you hear were generated using MidiLoops.
The "singing" instrument is not Pd, it is a software synthesizer.

http://www.disc-shelf.com/droning/droning071.ogg

Guys, fixed a bug (stack overflow due to infinite loop), plus added a couple of global controls and did some minor adjustments, like going for seconds instead of milliseconds in GUI. Same link.