I have a problem regarding several projects where certain instrument tracks (both softsynths and sample machines), by turn, either stop playing or suddenly generate a high frequency sound, while the playback of the other tracks continue. The only thing I can do is to delete / undo delete the respective tracks. It would be mysterious to me if it is the capacity of my setup that is too weak (MacBook Pro 2.66 GHz Intel Core 2 Duo, 4 GB 1067 MHz DDR3 + Presonus Firebox soundcard), which until now has worked fine, even with the same amount of instrument tracks (20+). The ASIO time usage meter is very excited, so I have tried changing the buffer size and bouncing tracks without luck.
Thanks for your help, it is greatly appreciated.