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Hi...I am Duarte Vinagre and i started to learn Mastering around 2010! 
Nowdays i make mastering for Electronic music only pricing $20 per track. (FIRST track is free for all customers so you can evaluate my skills.) 
If you wish your tracks to be mastered by me contact me at: 
These tracks were made exclusive with Samplur PROSTUDIO, mixed with Samplur PROEFFECTS and mastered by me, Duarte Vinagre using Samplur PROMASTER!