I have been using Tristan Zand's iOS app Loopr a
bit via my iPad.
I did this piece recently using my recently de-fretted
mandolin.
I did 4 foundation trax in Loopr, exported them, important
in to Audacity, extended and manip'd some using PaulStretch
and some reversal. Piece was done for this weekends
Sound-In.org event.
Jim
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jimgoodin.com - 'Acoustic
guitar renaissance, color blue, repetitive minimalism'