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An 18V supply is not the same as a headroom of 18V.  As Tonmann discussed, the output SIGNAL level will not exceed 2-3 V depending on the input level that the amp first stage can accept.  The supply voltage sets the rails of the power supply, not the output voltage.  If the signal level at the LAST pedal in the chain is around 1-2 V, that should be plenty of signal level for the amp to do its job.