[DISCONTINUED] VOX Pathfinder 15R Guitar Combo Amplifier, 15W, 1x8" Gain Control. Set higher for crunch and distortion sounds and lower for cleaner tones. Boost Switch. Press in for more gain and distortion. Press out for cleaner sounds. You can turn this function on and off remotely with the optional VFS2 Footswitch. Volume Control. Controls the overall volume. Set high for clean sounds. Lower the level when setting the Gain control high for distortion. Treble Control. Adjusts the higher frequencies or treble in your tone, from soft and full at one extreme to bright and cutting at the other. Tremolo Speed Control. Controls the speed at which the built in tremolo oscillates. You can also control the tremolo function remotely with the optional VFS2 Footswitch.