Check the listing for details. Source Audio SA 252 - One Series Atlas Compressor. Condition: New. Listed at 283.60 USD. The Source Audio SA 252 One Series Atlas Compressor offers a comprehensive collection of different compressor circuits that perfectly capture the sound and feel of the most sought-after compressors on the market and with the push of a button, Atlas can be easily optimized for guitar or bass. With the Factory Presets, Atlas offers six different compressor styles, ranging from classic stompbox compressors to high-end studio rack units. The pedal also features advanced dual-band compression, allowing separate treble and bass compression with individual settings. Each compression engine has onboard controls for Threshold, Ratio, Attack, Release, Output, Tone and Mix, allowing fine-tuned control of the compact One Series hardware. As with all One Series pedals, it is possible to get even more.