MARV is just both sides of the pedal on at the same time ( like a polyphase). It can be subtle or not...it's a quack on the front of the vibe/phaser. I don't know if that is trippy or liquidy.what mods are you getting done? all im aware of is the up/down and the marv mod. i hear the marv gets you pretty trippy and liquidy phaser sounds but i also hear it gets old fast.