object KeyTrack extends ProductReader[KeyTrack] with Serializable
A (12TET major/minor) key tracker UGen. It is based on a pitch class profile of energy across FFT bins and matching this to templates for major and minor scales in all transpositions. It assumes a 440 Hz concert A reference. Output is 0-11 C major to B major, 12-23 C minor to B minor.
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- def kr(chain: GE, keyDecay: GE = 2.0f, chromaLeak: GE = 0.5f): KeyTrack
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the output (buffer) of an FFT UGen which transforms the audio input to track. For the FFT chain, with a standard hop of half FFT size, the FFT size should be 4096 at 44.1 or 48 kHz and 8192 at 88.2 or 96 kHz sampling rate.
- keyDecay
Number of seconds for the influence of a window on the final key decision to decay by 40dB (to 0.01 its original value). Can be control-rate modulated.
- chromaLeak
Each frame, the chroma values are set to the previous value multiplied by this chroma decay. 0.0 will start each frame afresh with no memory. Can be control-rate modulated.
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- def read(in: RefMapIn, key: String, arity: Int): KeyTrack
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