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Wrong F0 flutter frequencies
According to the Klatt 1990 paper, the F0 flutter delta should be calculated using modulation frequencies of 12.7 Hz, 7.1 Hz and 4.7 Hz The current implementation uses the time_count variable to calculate the amplitudes of these frequencies:
flc = sin(2*M_PI*12.7*time_count);
fld = sin(2*M_PI*7.1*time_count);
fle = sin(2*M_PI*4.7*time_count);
But time_count is incremented once per frame and therefore contains Hz * 100 and not Hz (the unit of time_count is 10ms instead of 1s). So the F0 modulation frequencies are actually too high by a factor of 100.
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