Every knob of the PLEX features push activated functions that allow the user to tailor every nuance of their sound beyond the range of traditional tone controls. As each knob is pressed, the indicator is lit blue to signify that an option is engaged and the readout displays the current option level that is active. Need more low end thump? Push the bass/ bump knob to engage multiple levels of bass enhancement. Scooping out some mids for the ultimate slap tone is as easy pressing the low-mid/contour knob until you find just the right notch. Get rid of excessive pick noise and click by pressing the hi-mid/ hi-cut knob. Add just the right amount of “air” to a dark instrument or speaker via the presence function accessed by pressing the treble/presence knob.