The Keeley 30ms Automatic Double Tracker is a versatile stereo effect pedal that creates thick, fuller sounds for guitars, basses, keyboards, and vocals. It features a reverb emulating the famous chamber in Studio Two. 

Chief Engineer Robert Keeley explains that automatic double tracking, made famous by Ken Townsend and John Lennon at Abbey Road Studios, enhances recordings by making it sound like multiple musicians are performing together. The 30ms pedal lets artists carry this technique on the road with various tools for unique double-tracking.

It can be used in mono with an “Abbey Verb” control or in stereo as the Double Tracker Pro. In Dimension Mode, you can create two voices with tunable delay for rich sounds. Abbey Mode simulates synchronised tape decks for a lush quality, while Slapback Mode offers a rockabilly-style echo.

In Stereo Double Tracker Pro Mode, the reverb is removed, allowing fine-tuning of two voices with delays of up to 30 milliseconds. Users can achieve true stereo double tracking, whether live or in the studio.