The two fractional forms are thus related by the factor 100/12. For oct, the fraction is interpreted as a true decimal fractional part of an octave. For pch, the fraction is read as two decimal digits representing the 12 equal-tempered pitch classes from. The first two forms consist of a whole number, representing octave registration, followed by a specially interpreted fractional part. With cpsmidi, the Midi note number value is taken from the Midi event associated with the instrument instance, and no location or expression for this value may be specified.Ĭpsmidinn and its related opcodes are really value converters with a special function of manipulating pitch data.ĭata concerning pitch and frequency can exist in any of the following forms: On the other hand, the cpsmidi opcode only produces meaningful results in a Midi-activated note (either real-time or from a Midi score with the -F flag). You must specify an i-rate or k-rate expression for the Midi note number that is to be converted. The input value for cpsmidinn might for example come from a p-field in a textual score or it may have been retrieved from the real-time Midi event that activated the current note using the notnum opcode. The cpsmidinn opcode may be used in any Csound instrument instance whether it is activated from a Midi event, score event, line event, or from another instrument.

Midi note number to frequency