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The wiper will have no problem, it just sees the voltage, but can't know if there is one or multiple sources.what happens on the wiper when two power supplies are put in parallel across a pot.
How comes that you give new specifications every time (have been talking about 5V only in post #3)?However, one effects unit uses 5volts and the other uses 3.3volts.
How comes that you give new specifications every time (have been talking about 5V only in post #3)?
As a generally consideration, you surely don't want to clamp 5V output to 3.3V without reasonable current limiting resistor.