Boost

Boost pedals raise level, add gain or do both. A clean boost mostly preserves the source voice and pushes the next gain stage harder; a coloured boost changes the frequency balance as it lifts the level, while treble or mid boosts narrow the emphasis deliberately. Gain, output, tone, presence and headroom shape the result. Place the boost before overdrive for more clipping, after gain for more level, or into a clean amp when a louder signal is the aim.