Module Row Width Depth +12V -12V +5V
5 Modules (0 passive)Row 180 HPmax 38 mm395 mA +12V104 mA -12V0 mA +5V
5 Modules (0 passive)Total80 HPmax 38 mm395 mA +12V104 mA -12V0 mA +5V
Humble Audio Quad Operator Humble Audio Quad Operator
4 Variable Waveshape Operators for Linear FM Synthesis
1  30 HP  25 mm  140 mA  13 mA  0 mA 
Humble Audio Algo expander for Quad Operator Humble Audio Algo expander for Quad Operator
Expander for Quad Operator's Algorithm Functionality
1  4 HP  25 mm  5 mA  ?  ? 
vpme.de QD - Quad Drum Voice vpme.de QD - Quad Drum Voice
Quad digital drum voice with internal mute/panning mixer and flexible CV routing
1  22 HP  20 mm  120 mA  10 mA  0 mA 
Intellijel Quadra Expander mk2 Intellijel Quadra Expander mk2
Expander for the Quadra Module adds VC of AD, EOC and Analog OR
1  12 HP  ?  32 mA  28 mA  0 mA 
Intellijel Quadra Intellijel Quadra
Quad Envelope / Function Generator
1  12 HP  38 mm  98 mA  53 mA  0 mA 

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