Ok thank you that works! I still have an increase in high frequencies with this filter set to 13k.
The problem is I have feedback sensitive things like a dyncamic mic on stage. It happened to me with my last gig that during soudncheck I look for problematic frequencies in the highs and I turn them down on my soundcard/mixer.
But then when I turn on the axoloti filter I get this boost in high frequencies and feedback starts again
I can take down the frequencies again on my soundcard/mixer but this is far from perfect and I still had feedback coming when turning on the filters...
I think if we would have a full range the sound of these filters would be much more linear. It's incredible anyway that they don't go up fullrange and even more that nothing about this has changed in the 2,5 years that this thread is existing.