Sly Dunbar is indeed the drummer on this album, as part of the session band that recorded these foundational tracks at Channel One Studio.
Musicians on 'The Dub Album' (2004)
The personnel for these specific 1977-era dub sessions include:
Sly Dunbar: Drums and syndrums.
Scully Sims: Percussion.
Robbie Shakespeare: Bass.
Radcliffe "Dougie" Bryan: Rhythm Guitar.
Bo-Pee Bowen & Earl "Chinna" Smith: Lead Guitar.
Winston Wright: Organ, Clavinet, and Harpsichord.
Johnny Osbourne: Harmonica.
Vocalists (whose voices are dubbed): Derrick "Duckie" Simpson, Michael Rose, and Errol "Jay" Wilson.
Earl "Wire" Lindo: Strings and Synthesizer.
Horns: Bobby Ellis (Trumpet), Headley Bennett (Saxophone), and Cedric Brooks (Saxophone).
Production
Prince Jammy (Lloyd James): Producer and Mix Engineer.
