Originally posted by Axl_Rose
What the hell are racks?!?!?

The simple way of explaining this is that you can have 19" wide rack-mount units in stead of all those little pedals on the floor. Hell, you can even have a rackmount pre-amp and power-amp, anything goes really.

Here's an example: http://www.johnpetrucci.com/images/equipment/rack_2002.jpg