[FEAT]: Allow finer grain control of speed/pitch changes about chorus HOT 1 CLOSED

@davior: The is possible and in the works already. I should be able to create a new release sometime tomorrow (my time).

On a side note. There is a demographic of people out there looking for a way to convert Spotify tracks from a=440hz to a=432hz. This change would allow them to get close to it (it just requires a pitchdown to 98.18181818%). This would probably prove pretty popular.

I did have thoughts on this, but more on using semitones to up and down shift. This would add more granularity for experts (or the more inclined), while leaving the more intuitive slider and the manual input for everyone else. Currently the pitch just stems from the frequency, but I want to give the option to set the pitch itself.

from chorus.