The Boost control helps compensate for the perceived loss in volume that many players experience when using a tremolo pedal. With the additional gain, you can cut right through the muddiest mix. To use the Mini Trem as a clean boost alone, simply turn the Speed and Depth knobs (counter-clockwise) all the way off, then adjust the Tone and Boost to your liking.
The Tone control offers the possibility of many different timbres of tremolo by letting you accentuate specific tonal frequencies in the effect. Turning the Tone to the right (clockwise) gives you more treble, to put an extra edge on a hard and choppy trem. Turn the Tone to the left (counter-clockwise) for more bass to get a murky, ambient pulsation. Try experimenting with different settings, you’ll find a sweet spot to suit any style you like.