This component is part of the Prophet Rev2 Expander Kit. This circuit board is designed for the Sequential Prophet Rev 2 and can be installed to upgrade the polyphony from 8 to 16.
The Sequential Mopho x4 Knob Kit bundles up twenty-five pot caps: fifteen DSI-916R knobs and ten DSI-917R knobs - all compatible replacements for the controls of the Sequential Mopho Keyboard.
The Sequential Tempest Knob Kit compiles twenty-four replacement rotary knobs, that's ten DSI-916Rs and fourteen DSI-917Rs.