In chapter 10 of the Audio Effects book you talk about making a vibrato. I've implemented my own vibrato with a delay modulated by an LFO and it seems like depth decreases as rate gets really low. In fact at 0.3 Hz and below pitch sounds constant to my ears.
I even tested with a tuner app on my phone. A sine wave at middle C (261.6 Hz) played through the vibrato only oscillates between 261.4 Hz and 261.9 Hz with a vibrato rate of 0.1 Hz and a depth equal to 3ms of delay at peak LFO oscillation. With the same depth but a vibrato rate of 0.4 Hz I measured the 261.6 Hz sine wave oscillating between 260.9 Hz and 262.5 Hz.
Is this expected behavior that a vibrato will have a weaker range at very slow rates? I found that even increasing the depth did little to increase the oscillation range.
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