Check the listing for details. Bias Peak Pro 6 Audio Editing Processing and Mastering Software 2009 Read Below!. Condition: Open box. Listed at 175.00 USD. The Bias Peak Pro 6 Audio Editing, Processing, and Mastering Software is a professional-grade tool designed for musicians, engineers, and producers in the music industry. With its intuitive interface and powerful capabilities, it is ideal for creating high-quality music productions and ensuring that audio is professionally mixed and mastered.