I get it too with high resonaces. I guess it?s because i hit the resonance frequensy when sweeping the filter and if using phaser at the same time (usually it?s just around a surtain note i get it). The phaser may hit the resonace frequensy and then the feedback amplifies it and that can get pretty nasty som times. Many times you can get around this problem by turning up the filter keyfollow to +32 and adjusting the filter until it goes away (usually a very small adjustment). This will cause the filterfrequensy to follow the key pressed so that you will never (or always if prefered) hit this resonace frequensy...
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