Obviously the clocking, converters and the audio interface play a trick on you. I bet any audio plays in double speed in 192kHz project. 192kHz are = 96kHz x 2. Meaning in order for the audio interface to produce 192kHz it runs twice as fast.
By the way 192kHz is overkill anyway. Use 96kHz for music recording or 48kHz.
So its only preview before import to project? Never imported midi files into the project of VSTi in the project?
If that case its all about wrong sample frequency and change of sync clock. Preview always try to playback in 44.1kHz even if project use other sample frequency.
What is your clock source? Internal or external clock?
clock = 44.1kHz 48kHz. There can only be one MASTER in any system. All other equipment are slaves to the MASTER. Often the audio interface itself are the master but highend studios often use external hardware device that are the MASTER-clock.
Sometimes DAWs sync to wrong clock. Meaning it use wrong device for MASTER. Cubase are set default to use its own internal clock. That you use Cubase as Internal source are not a direct issue here but the audio interface don’t perhaps play on same ball park. The don’t want to work together and probably they both try to act as MASTER.
Example. Cubase use 96kHz but the audio interface still continue to use 44.1kHz?. = wrong sync-clock.
This is exactly what you experience in example 192kHz.
What you need to do is to go over the settings in your audio interface and check when you are in Cubase that the play ball.
Both use the same frequency example 48kHz. It can also be that in preview midi mode the audio interface change suddenly back to 44.1kHz even if the project are in 96kHz.
This is exactly as I talk about. As far as I understand, yes its set to use 44.khz only mode and that’s why you have these kind of problems. Remember it can only be one MASTER.
Always use 24bit mode. Set it up so it change and follow Cubase frequency example 48kHz, 96kHz etc.
Set the Digidesign 003 to slave so it follow Cubase clock or other clock source.
I strongly suggest you read up on how clock and synchronization work and is. You can start read all about this in the Cubase manual page 650.
You should contact AVID official support, they can help you further with this problem. It has nothing to do with Cubase, its your audio interface. More AVID users have the same problems you have and with other DAWs. Check this forum.