Ear Training

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I came across this site the other day, which claims to help with training your ears when EQ’ing etc. The whole interface looks really user friendly. I’m just wondering how being able to identify a certain frequency of an isolated sound would translate across say a whole mix? Would being able to identify the 200hz region of a kick drum mean that you’d be able to hear if something was interferring with it when in a full mix situation?br
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It would help a great deal… If you listen to your mix and there is something that is annoying you about it, you would be able to hear it’s specifically the 200hz spot which is bothering you as opposed to something bothering you, but you’re not sure what.