Raff has put together a free Mixing PDF book which has guidance on mixing your music, along with tips on getting your music ready for mastering. With over 25 years of audio engineering and 15 years of mastering experience, he has encountered many challenges with his mixes and so many issues with other people's mixes, and although he shares the findings on social media channels when they occur, or spring to mind, he wanted to publish a free PDF book which contains them all in one place that can be updated regularly with new findings.