By default you can use left and right bracket keys []
to adjust speed, and it should do adjustments to make the pitch sound the same.
To adjust the pitch alone, you can have something like this in your input.conf, customized as you like:
ALT+p af toggle @rb
ALT+UP af-command rb multiply-pitch 1.25
ALT+DOWN af-command rb multiply-pitch 0.8
ALT+LEFT af-command rb set-pitch 1.0
I haven’t looked at this in a long time. If you always need this there’s likely a conf option to always enable the “rubber band” (@rb) filter. And maybe other commands than multiply that would be better.
EDIT: Sorry, I don’t have this quite right. Maybe someone can correct me.
So . . . not relevant to my comment?