Clicks/stuttering on Mac Pro? What's causing this

Audio file example (recorded on an iPhone pointed at my studio monitors):

This is an Apogee Quartet set to 256 samples, 7ms latency. Mac Pro 8-core 2.66GHz, 16GB RAM. Kontakt is the only VST in use on this project, eating up 4.6GB or RAM only. As I start to bump up samples to 384, the problem diminishes noticeably. Here I thought my machine could handle this—guess not! And the Apogee Quartet manual recommends 128 samples, which was even worse!

So am I delusional that my system should be able to handle 128 or 256 samples smoothly? :slight_smile:

Do you use Memory server in the Kontakt (Options > Memory)? Do you use 64-bit Cubase? Do you have last version of Apogee driver? Do you have last update of Cubase?

Yes, yes, yes, and yes. :slight_smile:

Congratulation, it shlould works! :slight_smile:

Can you try to switch to the built-in sound card? Just for the test. Does it work?