Here's a screenshot of one of the Reaktor instruments I have built from scratch for the Stevie Starr gig. It's a phrase looper that allows you to set the sampling length in beats, once you have specified a tempo and a subdivision. At a sample-rate of 44.1kHz the maximum phrase/sample length is about 46 seconds, which is plenty long for most things. This looper can also sync the play and/or record functions to the Reaktor clock, thereby allowing the synchronisation of the looper with any other loops or sequences that are running off the same clock.

This one was built for the song 'We Shall Get In' and is the tool I use to capture and loop the opening glockenspiel phrase. I then use another, almost identical looper to capture a second glock phrase which I reverse and play against the first loop as the piece develops.

I'm currently also working on a more powerful version of this tool which has the option to manipulate playback speed in realtime as well as an overdub record function and some more intuitive ways to set the loop length for improvised live looping.