mtof — Convert a midi to frequency
Plugin opcode in emugens.
Convert a midi note number value to cycles per second, taking global value of A4 into account.
kmidi / imidi -- Midi note number (also as array)
kfreq / ifreq -- Frequency corresponding to midi note value. An array is returned if the input is an array
Here is an example of the mtof opcode. Play mtof-ftom.csd
Example 640. Example of the mtof opcode.
<CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1.0 A4 = 440 instr 1 kfreq = mtof(69) printks2 "midi 69 -> %f\n", kfreq kmidi = ftom(442) printks2 "freq 442 -> %f\n", kmidi kmidi = ftom(442,1) printks2 "freq 442 -> %f rounded\n", kmidi kfreq = mtof(kmidi) printks "midi %f -> %f\n", 1, kmidi, kfreq imidi = ftom:i(440) print imidi ifreq = mtof:i(60) print ifreq turnoff endin instr 2 imidis0[] fillarray 60, 62, 64, 69 ifreqs0[] mtof imidis0 printarray ifreqs0, "", "ifreqs0" kfreqs[] fillarray 220, 440, 880 kmidis[] ftom kfreqs puts "kfreqs", 1 printarray kmidis, 1, "%.2f", "kmidis" turnoff endin </CsInstruments> <CsScore> i 1 0 1 i 2 0 1 </CsScore> </CsoundSynthesizer>