[CM] tap fixed - patch to tankrev.scm

[anders.vinjar at nmh.no]

Here's a patch to tankrev.scm.  The negative delay-times in the previous
version were temporary workarounds to not hit the (now fixed) bug in
tap.

Redefining smpls->samples as a macro here to avoid some unnecessary
calculations in the loop.

Btw, do we want this?  Does s7 do checking and optimizing of fixed
values like these in a loop?  Suggestions and improvements are of course
very welcome.

-anders

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