To be honest, it is so much easier to perform edits such as "crossfade looping" on a computer that the comparison to trying to do it "onboard" creates more problems than solutions, especially when trying to edit multi-sampled instruments. Our good friend John Melas has created such an elegant, powerful and amazing solution with his Waveform editor that if you ever experience using it you will not want to manage, edit and even create Motif samples any other way. And for what it does, it is not that expensive. Check it out at
http://www.jmelas.gr.