The essence of a new instrument is simply an elegant and effective method for manipulating sound.
In this really early sketch I am trying to find the right gesture for changing the offset and loop duration of a sample. I am finding that this has the potential to be extremely visual. By touching the sound in the area or region that you want to play next it will play from that point. Moving your touch higher on the y-axis increases the rate of the playback. I tried various approaches including the multi-touch zoom technique. These other approaches seemed too disconnected and slow. It may not play immediately because it will always remain on time to a certain extent. It is more or less quantized. This is different than just pulling up an audio editor and setting the loop points on the fly or triggering audio samples should be clear if you have tried these approaches.
Next steps here are to extend these gestures to include reverse, fast forward, beat slicing and granular synthesis.