Pitch dips on HDIO?

[melodydetective]

2013 Mac Pro, HDX in a Sonnet chassis, HD|IO 16x16. No sync peripherals, no external word clock.

Any reason why sometimes the pitch of the session I’m on (VI’s and a couple of audio tracks) might suddenly waver? Only slower, never faster.

[JFreak]

Sample rate mismatch? If you have recorded 48k and playback 44.1k then it is slower.

[Ben Jenssen]

Did you accidentaly hit shift-spacebar which triggers half-speed?
Sorry. I recently did it myself, and I needed a few seconds before I realized what happened.

[melodydetective]

It’s neither of those two. Though I wondered at first if it were Kontakt hiccuping because its SRC was wonky, I’ve heard it do it on audio-only sessions.

[Rich Breen]

Originally Posted by melodydetective

...I’ve heard it do it on audio-only sessions.

That's pretty odd. If that's true, then unlikely there's a software reason; seems likely to be hardware, and most likely spot would be the HD I/O. You're certain that HD I/O is on internal?

How far does it dip? For how long?

A good troubleshooting start would be if it does it when running on external clock.