There was a time when any hi-fi worth its salt had a little row of sliders on its front panel, a graphic equalizer ... We’re more used to graphical displays for off-the-shelf devices.

Part 1 - Photoshop CS6 Extended tutorial showing how to create a retro, graphic or music equalizer. In Part 2 (the next tutorial) - I'll show you how to complete the disco image with retro text and ...