The function of the
Trim knob(also known as Pad or Attenuation) on your mixer is to control
the level of the incoming signal. Set it to high and you will get horrible
sounding distortion, but set it too low and your signal will be too weak
to effectively record. Always start with the trim turned all the way to
the left. Slowly begin turning it to the right as you begin to add signal
(testing, testing 1-2-3…)