The VPK-5 was a polyphonic keyboard with pressure & velocity sensing and an XY spring loaded joystick controller. It was sold to control the Voyetra Eight. It connected with the Voyetra's "keyboard input" interface by an XLR cable. The VKP has program advance buttons and modulation range knobs but there are no controls on the VKP itself to perform splits, etc. Splits, layers, unison are handled on the Voyetra Eight itself. The VPK-5 could control multiple Voyetra modules simultaneously.