Crafted with the same metal film capacitors and precisely matched transistors as its two-knob counterpart with the addition of attack speed and input gain knobs as opposed to internal trim pots, the Keeley C4 4-Knob Compressor brings an even higher degree of controlled, precision compression to the table. Already capable of summoning perfect, squishy funk and chicken pickin' tones through manipulation of just the sustain and level knobs, the on-the-fly adjustments available with the added attack speed and input gain controls allow for going straight to Gilmour-esque territory in between songs on stage.