This manual describes how to install uniPulse in a Boss DR-110. If gives you velocity sensitive trigger of the instruments. You can also trigger accent via midi.
The DR-110 can also be synced to midi clock.

The following schematics show where to connect the uniPulse trigger outputs P1-P8 and the uniPulse digital outputs D1-D3. (Click for a larger image)D2 and D3 need to be connected via two additional diodes, any diode is fine.UniPulse is powered from the DR-110 6V supply (V+ and GND)

Midi clock control is supplied via the digital outputs D1, D2 and D3. If you connect them directly, the DR-110’s own clock will be overridden. If you like you can add a switch to disconnect D1, D2 and D3.

After installing make sure the uniPulse LED is on, otherwise you might have a problem with the power supply. Then you need to upload the configuration file using the editor.

Here are the trigger points on the PCB as reference: