When a signal on one conductor or channel inadvertetly appears on another one.  Crosstalk in synthesizers has two main causes: (1) signal-producing circuits, such as VCOs , which "bleed" over into other circuits via coupling through the power supply, due to inadequate grounding (this can be a particular problem in modular synthesizers ), and (2) signals that cross over within an adding or mixing circuit, due to inadequate isolation between inputs (often a problem in synths that use a pin matrix for patch routing, such as the VCS3 and the ARP 2600 ).  

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