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Practically any DAW can be used for mastering, but it's the ears and monitoring equipment that make a difference.
Sir you forgot another factor... the budget of the client.
funny how these days i always hear remarks about a mastered track... it seems that making a track as loud as can be e mastering na. the art of sequencing and appropriate levels e neglected na.
Agree.Software has made it even easier to slam the levels making tracks almost painful to listen to. I remember playing around with Izotope Ozone's 'mastering' preset... it was a novelty at first, but then ear fatigue became more frequent. I hardly listen to music nowadays, and I miss our family's old turntable and vinyl collection.