/diy/ - Do It Yourself

Hello /ohm/
Right now the Volume pot takes postive and negative waveforms and every frequency gets canceled resulting in lower volume. The High Filter however acts as a variable high pass on the volume only. The lower the volume, the lower the effect of the high pass. But I would like to have the same (or at least a bigger) range of filter in every volume position and I want to do this with passive components only.
Maybe I am just stupid, but is this possible? E.g. take a stereo pot and change the way the filter responds to the volume when changing volume? Adding another capacitor? Any way?

tl;dr
Is there any way to make pic related more effective on low volumes with passive components only?