Apart from Pete's slight modifications that give this new pedal a tighter bottom-end and slightly softer high frequencies, it is exactly the same gain structure as the High Gain setting on the original Pro-Series PlexiTone....it just plays better with different amps. 

The single Plexi also incorporates our new DC-DC converter circuitry, so the pedal can be powered by a regulated 9V Power Supply but will still operate on the same plus/minus12V level as the original AC powered PlexiTone. This allows us to use the same high quality components which provide the same tone and headroom that make the CM Pro-Series stand out from the rest!