Introduced in 2000, the Godin Multiac Grand Concert Duet was like the Multiac Grand Concert With Synth Access but it had a rosewood fingerboard and a custom L.R. Baggs Duet System with both a piezo transducer and an internal microphone. The Multiac Grand Concert guitars were designed to give a more traditional classical guitar feel. They have a larger body than the other Multiacs and a Solid Cedar top with a neck joining the body at the twelfth fret. The 2" width at the nut is slightly larger than the standard Multiac and gves a more classical feel.

Production of the MultiAc Nylon Duet Custom Shop (Model 4836) began in 1998 and ended in 1999