basic features audacity does not have

No filters in audacity:


please use opencl.


Low pass:

High pass:


At the time I could not find them in the menus, however I find their implimentation poor, they should have an option for multi frequency filtering. One dialog box ie low pass filter should have optional frequency bands bands to apply a filter multiple times with only one shot. However it will be slow because everything is still done on cpu.

I would also like to add there is no band pass filter (very usefull) and low, high and notch do not have settable q values.

There are some additional filters here:

Audacity also ships with this set of filters, but not enabled by default:

There’s also this set of filters:

All of those are possible via audacity’s spectral-selection tools …