Hey I got it working! I could not get the dynamicsProcessor submix effect to work as a total limiter - there was always some audio coming through with all settings i tried. In the end i used one low pass and one high pass filter, each set to not let anything through, to get silence!
The recording and visualization of the submix still works.
edit: we don’t even need effects to silence - we can set the submix output to 0 vol as in the picture below. Seems to work.
