(solved) Snow produces strange noise in Analog Output

[loudness]

Hello, I hope one can help me here.
I've noticed some, I'd say electrical, noise when using the analog outputs of my TI Snow. I can also see it on the analyzer, sounds a little bit like an old 56 K modem going online but without the whitenoise if you know what I mean.
I've tried different inputs on my RME, switched cables, check for powercables nearby, but it's definitely coming from the TI.
Anyone an Idea, or the same problem?
This does not happen when I use the USB port as Output,
but since I can't stand the latency I need the Analog Outs.
Thanks for your help!!!!