Pro Audio Engineer since 2001. Developed first automated intelligent digital mastering system in 2003 and have been using it to assist with mastering work since then.
Use Crazy Daisy mastering suite, which is an automated intelligent mastering system that determines some of the basic mastering adjustments to be made to each song on a case by case basis. I fill in the details using experienced human artistry. The hybrid combination of automated technology and experienced human application provides a consistently high quality sound with a real human flavor to it. I've personally mastered over 50,000 tracks using this system, and have had a few engineers working for me using this system as well.
$30 to master a single, mixing+mastering typically $75-$100 per song. Discounts for multi-song projects. Free mastering sample. Free mix evaluation.