I have a bad metronome, so how do i convert different note value tempos? eg If the song is a dotted quarter note=140, how fast is that with a single quarter note?
If it says dotted quarter note = 140 and the time signature is 12/8, play three eighth notes per click.
A quarter note is two thirds the length of a dotted quarter note. Hence, the dotted quarter at 140 would be a quarter note at 210 bpm. I hope this is what you were asking?