The "need" for a mixer is to allow you to control your sound. If you have the limited performance possibility that gives you the same exact set up for every performance (never seen this) then you may not need one. However, my mixer is part of my pedal-board set up so no matter where I show up, and no matter whether I'm using my own speaker set up, or a large-venue house system, my sound stays the same. My sound guy sets up my board so it is maximized for what I am plugging in and running through. Therefore, when my line out is run to a house snake or speakers, or house PA or.... my sound can be easily tweaked by me or the sound person in a couple of minutes. Consistent high-quality sound quality is the goal.
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