The Drawbars also serve the Combo and Pipe Organ divisions, but with a slightly different function.
It adds a silken quality to the sound by adding a second, slightly detuned pitch to the original in the Chorus Mode, and repeat-modulating the pitch slightly in Vibrato mode.
Hammond's adherence to quality has allowed many vintage instruments to remain vital today, and they are among the most desired and imitated musical instruments ever, but at a high cost.