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When I turn on the power, the pedal amp wont turn on. [ISP TECHNOLOGIES / DECIMATOR II G STRING PEDAL]

This pedal amp is supposed to be gated including noise generated in the preamplifier by connecting the SEND / RETURN of the amplifier. GUITAR OUT is just through the output.
If you do not connect SEND / RETURN, the GUITAR OUT will be directly connected to DEC IN, and DEC OUT will be connected to the input of the amplifier.

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