Question

I have sampled a trumpet note and keymapped it to MIDI notes 55 to 65. If I play MIDI note 60 and hear middle C, what will I hear if I play MIDI note 62?

Answer 1

The answer is D.

Step-by-step explanation:

The musical interval between two notes depends on the ratio of their frequencies. An octave is a ratio of 2:1, an octave comprises 12 equal semitones. Each semitone therefore has a ratio of:

`2^{(1)/(12) }`≈ 1.059

Then by convention, A4 is often set at 440 Hz and has MIDI note 69.

MIDI note 68 wich is one semitone below A4, that is, G#:

G#=
`(440)/(1.059)`=415.3 Hz

MIDI note 67 wich is one semitone below G#, that is, G:

G=
`(415.3 )/(1.059)`=392 Hz

MIDI note 66 wich is one semitone below G, that is, F#:

F#=
`(392 )/(1.059)`=369.9 Hz

MIDI note 65 wich is one semitone below F#, that is, F:

F=
`(369.9 )/(1.059)`=349.23 Hz

MIDI note 64 wich is one semitone below F, that is, E:

E=
`(349.23 )/(1.059)`=329.63 Hz

MIDI note 63 wich is one semitone below E, that is, D#:

D#=
`(329.63 )/(1.059)`=311.13 Hz

Therefore MIDI note 62 wich is one semitone below D#, that is,D:

D=
`(311.13 )/(1.059)`=293.6 Hz