One of Wolfgang's main tools for mastering his own tracks is the Crane Song STC-8 Compressor.
Original source is a Q&A with Wolfgang Gartner on [Sounds/To/Sample](http://www.soundstosample.com/blog/q-a/wolfgang-gartner).
In this Instagram post of Hardwell's new rack the Crane Song STC 8 can be seen near the floor
Wolfgang main mastering tool
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