beta bug fixes

lots of fixes to the previous untested release:

• no longer requires 2^N frames buffer
• record offset initialized more correctly (doesn't glitch at non-integer write speeds), and can't be modulated (it's more dangerous than useful.)
• silence output when play is disabled
• clamp rate to +/- 32 so it doesn't crash Max
• clamp SVF freq to 1/2 nyquist so it doesn't explode
• update filter with per-sample rate change
• fix filer modulation algo.

beta-ish

drop softcut~.mxo (softcut~.mxe or softcut~.mxe64 for Windows) from the .zip into your project folder, or add it to your search path. now softcut~ will be an available object.