Understanding the Audio Mixer Cost: $9.99 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions Understanding the Audio Mixer: Basic training course for sound engineers: Learn how to operate sound systems. This training course is excellent for all beginning and upcoming sound reinforcement or studio engineers. Great for band sound engineers, church sound operators, and everyone who wishes to learn how to operate a professional concert sound system.