In addition to the touchscreen, the Patch-A-Tron has 2 LEDs, 9 momentary pushbuttons and a 16 key keypad for I/O. The 16 key keypad allows the user to save and recall configurations. The LEDs provide feedback on the keypad input. 8 of the 9 SPST buttons are used to select/mute/unmute the 8 channels of the Patch-A-Tron. The remaining button is a master reset that disables all bends and returns the configuration to 'stock'. It is the red button on the upper left corner of the TR-626.

Connections are:

• 16 key keypad - Rows pins 3, 4, 5, 6; columns pins 7, 8, 9, 10
• 8 'Mute/Select' buttons - Pins 38 ,39, 40, 41, 42, 43 ,44, 45
• RESET button - Pin 37
• Programming LEDs - Pins 22, 23

The Roland TR-626 has 8 SPST switches and 8 SPDT On-Off-(ON momentary) switches on the right upper corner which are connected to dedicated circuit bends. (the Momentary switches are the top row and are connected to the RAM of the TR-626**.) The four knobs and switches in the middle 'pitch bend' four of the Roland's output channels. With each switch turning it's respective pitch bend on or off.

**The RAM bends sound really cool but must be turned off when not in use as they can make the unit unstable.