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The main reason is if you want to use more than two channels at once - for adding in samples, scratching, acapellas or whatever else.
But a lot of people who just stick to mixing 2 tracks together still prefer to play on a 4 channel mixer for various reasons... it saves a little bit of effort with switching between phono/line, also if the level from your CD decks is a bit lower or higher than that coming from your decks you may not want to have to make large adjustments to the gain/EQ every time you switch between formats. It also allows you to cue tracks up a track in advance... so you could have a track playing, cue the next track up and if you've got time you can then start cueing the next track up after that to save yourself some time later to use fx etc.
It's also quite useful to have the flexibility of using a separate mixer channel to return fx through from an external fx unit instead of using the mixer's normal fx send/return loop (if it's got one) as that lets you EQ the sound post-fx, gives you a channel fader to control the fx level with and also lets you use the crossfader with the effected sound.
Before anyone gets pedantic, although I realise technically the word 'effected' doesn't exist as the verbial form of 'effect' is 'affect', as I'm talking about the application of an 'effects unit' here, it does just about wind up being correct grammar. Thank you.
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Stu Cox |   
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nice
