too much compression, meaning that you are using compression and it is absolutley audible, when it really shouldnt be.
compression, unless you are going for a special effect, can really hurt if you arent using it right.
i compress to control dynamics, i try not to compress things that don't need to be.
on a master fader, if you are going for a mix and have no intentions of attempted to master, i guess you could slap on a limiter to raise overall volume, but once again, in a software app, i'd avoid that too.
i use a compressor on my PA system, in the effects loop, just to control dynamics and try to prevent from some idiot blowing all my speakers. i don't do that with my studio monitors, because, well, its usually so quiet already that i dont have to worry. just don't crank the monitors..
reverb is tricky too. too much makes it sound cheap sometimes. then again, if certain parts are too, dry say?, then that doesnt sound good either.
i'm saying, read up and practice getting into the happy zone with comp, verb etc. learning how, where and how much to use is purely dependent on some real trial and error. software makes it easier.
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