I have been working on an old Boss DR-110 drum machine since quite some time now and after completing tone control mods, I thought about recasing.
But while I’m at it, I would like to add more mods and improvement as (to my surprise), I have become quite fond of this drum machine and I use it more and more, especially live.
Apart from adding individual outputs (with switched jacks, like on the 808), I would like to add some sort of midi capability.
Right now if I want to sync it with the rest of my gear, I have to use it as Master clock through a Korg volca to translate the trigger signal (that I need to multiply on my patterns by 2 to reach 24ppqn).
So I have been thinking about adding an UMR2 to trigger the buttons and to be able to sequence the sound externally (with my LXR for and example, that would be sweet).
I have been reading all the documentation on the UMR2 on the (now dead) forum from Highly liquid but still can’t wrap my head around it.
Does anybody have experience with the UMR2 and Key switch Matrix systems and would be kind to give me some insights on the feasibility of hooking up the UMR2 to the DR-110?
Here is the service manual:
I still can’t figure out if the NAND gate would be an obstacle to the UMR2 and if the key matrix is Active High or Active-Low Select.
Feel free to point me to a simpler or alternative solution of you see fit.
PS: I dismissed the circuitbenders DIN Sync mod kit on this as I don’t want to add another MIDI to Din sync device on top of all the modifications I am planning.
(Image of the switch matrix)