His earliest influences included Bill Haley & His Comets, Neil Levang, Buddy Merrill, James Burton and Ricky Nelson.

While Duncan initially moved to England to record music, he also found opportunities working in the Repair and R&D Departments at the Fender Soundhouse in London.

[5] While at Fender, Duncan did repairs and rewinds for artists, including Eric Clapton of Cream, George Harrison of The Beatles, Jimmy Page of Led Zeppelin, Pete Townshend of The Who, and David Gilmour of Pink Floyd.

He established contact with people such as Leo Fender, Les Paul, and Seth Lover and continued learning about and making pickups.

[5] In the 90s, as a demand for vintage guitars began to rise, Duncan sought to replicate the tonal quality of '50s to '60s rock and roll through pre-aging specific pickups.

Notable artists and groups Duncan has created pickups for include Lady Gaga, Madonna, Prince, Bon Jovi, Earth, Wind and Fire, and Hall & Oates.

Duncan is still involved in designing and fabricating pickups at the factory as well as playing guitar and making appearances at clinics and conventions.

In 2012, he was inducted into Guitar Player's Hall of Fame and received a Lifetime Achievement Award from Music & Sound Retailer Magazine.