Not possible as yet, I’m afraid as the C4 filters cap at something like 6kHz if I recall correctly. @rsmith601 may be able to give an exact figure. A few of us have asked if it might be possible to increase the filters’ upper limit, given the rich harmonic content of the oscillators.
I definitely have found scenarios where I want some filtering on an oscillator, but even the fully opened filter is removing too much of that nice upper harmonic content. It would be great if this is something that SA will have the resources and desire to circle back to at some point; I am not sure how hard this would be to achieve though.

