Thanks to all for confirming.
I use quite a few vintage analog synths so it’s quite handy to have a working tuner.
I bought Blue Cat Hot Tuna which works fine but isn’t as accurate in the upper registers.
I did a trial of Cubase 12 Pro when it was originally released and noticed the tuner problem and it was one of the reasons I didn’t upgrade at the time… I thought “they’ve got to have fixed it by now…”
The same here on Apple Silicon M1Max. The tuner breaks up in patterns of 5, then six when you direct monitor thru the Tuner.
I suspect the algorithm used for this VST tool is quite old. When they came out with the VST Amp Rack, the tuner pedal in the Master section behaves exactly the same way and is probably the same code simply reskinned, however…
If you instead inset SuperVision in the same slot and Direct Monitor thru it and use any of the chroma visualizations, it correctly tracks and displays them with perfect Direct Monitoring Audio.
Clearly some kind of clock or sync issue. PLEASE fix this Steinberg!!! its been TOO long.