Is it possible in Ardour to record at another speed?
I remember once recording on tape, the voice part was too high in pitch and they recorded at another speed to get to the note.
Why would you do that? You can very accurately change the pitch of a region after recording it.
For other speed-tricks check this thread: Help need for playback and transport
Yes since Ardour 6 this is possible. Although the quality may be better when you pitch-shift offline after the fact.
Context-click on the vari-speed slider, change mode to “wheel”. After that vari-speed changes persist (shift + click to reset to 100%). You probably also want to set unit to semitones.