For the sake of “let’s see if I can reproduce these EQ filter artefacts on my Digitakt too” I unfortunately have to say yes…
The base-width filter and LP / HP seem fine, but the EQ filters are not. The artefacts that are noticaeble are related to the filter frequency it seems, so ithey are louder and/or softer depending on different (not directly related to the tone) FREQ parameter values.
Thanks to Ess and DreamXscape for the methods they posted how to check this.
Details
I used the factory SIN sample on tone C4 (261hz) and in example one I disabled the filter, in example two I cutted some frequences using EQ-2. The artefacts that are produced are pretty noticable and I can’t imagine this is how these EQ filters are intended.
Both samples are recorded via USB (class-compliant mode) directly into Ableton Live.
SIN sample C4, no filter
SIN sample C4, EQ-2, freq 48, gain -64
