I play in a cover band and we only have 1 guitar bass drums and vocalist, so when the guitarist does a solo there s no rythme guitar or keyboard to back him up, so it all sort of falls flat, so i use a Boss GEB 7 equaliser during the solos, i only put the first 3 sliders up about 1mm ea and the level up about 1,5 mm s, so when i stomp on the pedal it boosts the bass and volume ever so slightly to fill the space.