I'd say it partly true. Pay most attention to whatever your trying to master but don't neglect to listen to whats going on around it. As the Jazz Guys say Listen with "Big Ears"
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer