Yesterday I tried to use Varispeed to record an impossible guitar solo written by a composer I work with. I used the Speed only option, and set the buffer to 512. There are four VI tracks existing in the song at this point, all frozen. Everything is working as expected with Varispeed off. With Varispeed on, anything below -15% causes playback to stutter severely and eventually cut out altogether. At -50%, absolutely nothing happens. Monitoring of the channel I'm recording from also cuts out. Recording works as expected, but without being able to hear the existing audio tracks, and with no input monitoring, it's pretty difficult. Seems to me this project is pretty light. My Mac is not top of the line, but it's well within the requirements. CPU meters are showing very low usage. Can anyone suggest things I can try to get Varispeed working?