I use a third party global audio equalizer on my PC and so, when I record a video, the equalizer is applied to the video’s audio. In Shotcut I use the bass & treble filter to negate this, but I haven’t gotten the perfect mix on that, because I don’t know their frequencies. If anyone could tell me their frequencies, I would appreciate it.
Looks like that’s a ladspa plugin. From the docs for that:
http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#tth_sEc2.35
I added these frequencies as tool tips for the Bass, Middle, and Treble labels for the next release v18.08.