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Old 30th March 2012
  #2
Registered User
 
I assume the supply is able to be set to a certain fixed voltage.
That has to be within the range of the synth, say 9volt.
Make sure, the polarity matches the synth.
This is more important than voltage.
There usually is a diagram in the plastic next to the power socket.
If unsure, measure with a DMM.
Leo..