Much smaller and thinner than its GK-2B predecessor, the GK-3B is similar to its guitar counterpart, the GK-3, but catered for bass players. Thinner controller unit (compared to GK-2B). Large and smooth GK Knob for controlling volume. Select Switch for selecting normal bass tone, synth sounds, or a mixture of the two. Attachment holder and double-sided tape included for easy installation. 

Compatible with GR-55, GR-20, V-BASS, and GI-20. (In October 2004, an updater will be available for download to make it compatible with GR-20.)