(Music Sales America). From multi-effects units to software plug-ins, digital instruments and soundcards, effects and processors are a crucial part of modern music. Yet even cheap units can be complicated to understand and operate. Basic Effects and Processors offers in-depth explanations of all the mainstream effects and signal processing treatments, along with tips on how to use them in music production. Once you've seen how these devices work, you'll be able to use them to record and mix.