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If you unscrew the four screws on the back of the STS-88 and remove the backplate, you will find an adjustable gain trimmer and a buffer switch.
The STS-88 runs from 9 to 18 volts using a standard DC center- negative power supply for pedals. Make sure you’re using a supply that provides at least 100mA.
Running the STS-88 at 9V will sound great, but if you want a bit more output, a dry signal boost and increased headroom, try any voltage you like up to 18V! The STS-88 does not run on batteries.