Horrible, Crackling Playback (also intermittently in Cubase Pro 10.5)

WaveLab
1

Nevermind.

2

It might help (but, maybe not) if you could mention what this mysterious interface is.

Maybe even what operating system you are using …

3

Nevermind

4

Nevermind.

5

Ok I guess I’ll have to contact support about this, instead.