I have a strange issue – when I set my project's sample rate to 192kHz my sound gets odd and I can't use most of Waves plug-ins no more. So watch the video:
Ok I got it. I set up a similar Logic session and tested different things.
Short answer: Your system doesn't have the processing power to support 192 kHz sample rate for the amp designer plugins. There might be other plugins that won't work either.
The way I figured this out is by changing the buffer size. Click on Logic Pro X -> Preferences -> Audio. Look for I/O Buffer Size. Increase this in steps and then playback with the Amp Designer on at 192 kHz. You should see the audio quality get slightly and slightly better. On my system, it never sounds good and if I set the maximum buffer size it says my system can't handle a buffer that big. If I set a smaller than default buffer size, the audio gets worse and eventually my system can't sync MIDI and audio any more.
- There's really not much point at running at 192 kHz unless you're a professional working on a movie or video game - in which case you'd have a system that can support it.
- If you want to go above 48 kHz, you should really invest in a quality USB 3.0 or Thunderbolt audio interface that supports higher sample rates. That will help with buffer sizes also.