StretchFix is a macOS application to solve the issues caused by gunky tape dubs to digital. It analyzes the SMPTE LTC track, and then uses this data to control a varispeed to correct the other files
The secretrabbitau (srvs) audio unit uses a weird non-AU-compliant buffering strategy wherein the output buffer is allocated every time Process is called...and is also not released by anyone, resulting in massive memory leaks.