Originally posted by Chuck H
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Originally posted by Randall
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Both channels are not used by the same instrument simultaneously in this design. We can ignore unused gain stages because there's no signal on them. If you follow the phase inversions in each channel you'll see that the normal channel only has one inversion before the phase inverter (which is supplied by the C node). The vibrato channel has two inversions of the dry signal, so there are like phase gain stages filtered at the same node. If that node isn't filtering there can be like phase interaction and that can cause oscillation. In fact like phase interaction is how oscillator circuits are made.
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