Creates an interval list from a pch chord

Converts the cents into a scaler value 2^(cents/1200). 

Translated from Common Music.

General function for converting value a to frequency.  It will convert
keywords, MIDI note numbers, PCH, strings, and symbols.

Inverts a list of pchs given the version number

General function for converting value a to MIDI notenumber.  It will convert
keywords, PCH, strings, and symbols, and return any other value. Assumes PCH 
is 12 TET with [8 0] as Middle-C (MIDI Note 60).

Convert keyword or symbol to frequency (i.e. :A4 is 440.0)

Converts keyword or symbol to MIDI notenum (i.e. :C4 is 60, :Cs4 is 61)

Convert MIDI Note number to frequency in hertz

Converts PCH to frequency. [8 0] is equivalent to Middle-C (MIDI Note 60),
which is equivalent to :C4.  Assumes 12 scale degrees per octave (12 TET).

Converts PCH notation to note number. Optional number of
scale degrees per octave, defaults to 12.

Converts PCH notation to Csound-style pch string.

Add interval to pch (i.e. [8 0] 11 => [8 11]). Defaults to 12-tone octave.

Return the interval between two pitches (i.e. [8 0] [9 1] => 13). Defaults
to 12-tone octave.

Given a base PCH pch and sequence of intervals x, generates a sequence of Csound pch strings.  For
example, (pch-interval-seq [8 0] [1 -2]) will yield ("8.0" "8.01" "7.11").

Given a base PCH pch and sequence of intervals x, generates a sequence of PCH's.  For
example, (pch-interval-seq [8 0] [1 -2]) will yield ([8 0] [8 1] [7 11]).

Converts a scaler into a cents value 1200*log2(ratio). 

Translated from Common Music.

Convert string to frequency (i.e. "A4" is 440.0)

Converts string to MIDI notenum (i.e. "C4" is 60, "Cs4" is 61)

Convert keyword or symbol to frequency (i.e. :A4 is 440.0)

Converts keyword or symbol to MIDI notenum (i.e. :C4 is 60, :C#4 is 61).