Change the autowah to have a cutoff range of 20Hz to 20KHz
Change the autowah to have a cutoff range of 20Hz to 20KHz

This is the same as allowed in the SF2 spec for its filter cutoff generator,
which can be used for a wah effect in MIDI. It makes sense to use a similar
range here.

arkana-fts/openal-soft,alexxvk/openal-soft,alexxvk/openal-soft,irungentoo/openal-soft-tox,BeamNG/openal-soft,Wemersive/openal-soft,aaronmjacobs/openal-soft,Wemersive/openal-soft,BeamNG/openal-soft,aaronmjacobs/openal-soft,arkana-fts/openal-soft,irungentoo/openal-soft-tox