Having a peculiar issue, and have done various troubleshooting to arrive at a Cubase 6 issue.
Playback and recording is absolutely trashed when using a USB Interface. Tried Audacity, recording and playback is smooth. Ran an installation disk of Cool Edit Pro I’ve had for well over a decade in Crossover. Even IT understood my Aggregate Device and was able to record and playback properly!!
Curious if Cubase itself was the issue, I installed the free trial for Cubase Pro 9 in an attempt to single out a software hiccup, and everything worked smoothly. It’s just Cubase 6 that it doesn’t like.
I’ve experimented with buffer sizes, different interfaces (Yeti USB Microphone, Focusrite Scarlett 2i4), and the only thing I’ve found is that the built-in headphone jack and mic work flawlessly with Cubase 6. When using an Aggregate Device or just the USB ASIO driver, it produces the issue in the video below:
Also potentially worth noting:
-Whatever interface I use get completely crashed by Cubase 6. I have to quit the program, unplug, and replug my interface.
-My same license for Cubase 6 also works on my Windows 7 and Windows 10 machines, whose hardware specs are far worse (first generation i7-870!).
-I’ve tried every USB port already, have not tried a powered USB Hub.
Thanks for your help!