[CM] tap fixed - patch to tankrev.scm

[bil at ccrma.Stanford.EDU]

I have it!  Since these are sampled, you'd have a
sort of pointilistic painting (or cube?)
that you could zoom around in, and whatever
is underneath is the current sample, so you'd have
infinitely many pieces and travel around in them.
All in real-time of-course, so you'd only actually
have to compute one path.  And intermediate steps
could involve tempo maps + audio interpolation. It will
work the first time.