• The GPMX-16 has 16 GPI (general purpose interface) inputs and 16 GPI outputs arranged on four 9 pin D connectors. D sockets for inputs and D plugs for outputs.
• Each block of 8 inputs and outputs can be assigned a starting MIDI note number and subsequent inputs and outputs follow on consecutive note numbers. Default for the first block is 36 - 43 and for the second 44 - 51.
• MIDI channels can be set independently for inputs and outputs. Default channels - transmit = 1 receive = 2
• The debounce value for all switch inputs can be set (range 1 to 100 milliseconds - default 10mS)
• The inputs are arranged with internal pull-ups, so that shorting an input to ground will send the appropriate MIDI ON message - releasing the short to ground will send a MIDI OFF message (unless disabled)
• GPI outputs can be pulsed (default) or controlled with on & off messages
• GPI outputs are floating and can each switch up to 50 Volts at 100mA of resistive load
• Pins 1 - 8 are the output pins and pin 9 is the common connection. Pin 9 can be + or - relative to pins 1 to 8
• There are two MIDI output sockets which both carry identical MIDI information. MIDI arriving at the MIDI input is merged with the data generated by the switch inputs and sent to the MIDI outs
• The unit is powered by an external multi-region power supply connected by a locking plug (included)
• Editing of parameters is achieved by use of push buttons in conjunction with the LED display
• Settings are stored in non-volatile memory. In order that settings cannot be accidentally changed, edit mode has to be enabled by the use of a recessed push button

If you decide an product is not suitable within 14 days of delivery, you can return it to us for a replacement or refund. Returns must be unused and in their original, undamaged packaging.

Some items are excluded from our money back guarantee:
- Computer software that has been unsealed or registered
- Any item that comes directly into contact with the nose, ears or mouth

To arrange a return, just contact our customer service department on 020 7424 2800 or via our customer support form.