Guy currently owns six accordions.
His primrary solo instrument is a Titano Royal Convertor Piano Accordion, designed and manufactured by the Titano Accordion Corporation.
This is a "convertor-style" instrument: i.e., while the right hand side has a standard accordion keyboard, the bass button board (left-hand side) contains both a 120-bass Stradella (or standard) Bass system of bass notes and pre-set chords; and a 4-row, chromatic free bass system, consisting of all single tones, with a range of over 4-1/2 octaves. A convertor switch is used to go between one system and the other.
The free bass system makes it possible to play left-hand melodic lines over several octaves, open voicings, chords in any inversion, non-diatonic harmony and single-octave drones and bass lines; while the convertor system allows the performer to still have access to the Stradella Bass for standard accordion accompaniments which are invaluable for use in folk and world musics.
The Royal is a chamber accordion, meaning that two sets of reed blocks are in a "chamber," giving it a bigger, more rounded sound. He also has a Titano Virtuoso convertor, which is a non-chamber version of the same design.
For musette work, he has an early '80s Excelsior, which he obtained from Charlie Giordano, and which he has used on several film scores, including The Adventures of Tintin and The Terminal.
For specialty work, he has a Scandalli bass accordion with a low E (same sounding low note of string bass). This instruments also appears several times on Dancing on the Volcano, including on Meet Me on the Midway.
Guy also has a Lo Duca Bros. accordion from the 1940s which doesn't play so well, but looks great for photo ops, as it has typewriter-key-style register switches, and a "mute" switch which can open over the grill, revealing a cool red underside.