And in the opposite direction , to obtain the frequency from a MIDI note p , the formula is defined as :
where p is the MIDI note number ( and 69 is the number of semitones between C ( note 0 ) and A ) .
In the opposite direction , to obtain the frequency from a MIDI note p , the formula is defined as :
where p is the MIDI note number ( and 69 is the number of semitones between C ( note 0 ) and A ) .