Highly Liquid UMR-2


I did a 1st batch of Highly Liquid UMR-2 interfaces a couple of months ago with great success.
I’m running the 3rd batch right now.
UMR-2 is the only way to add MIDI to Yamaha CS01 and VSS30 as well as the Casio SK series sampling keyboards.
I also successfully installed it in Juno-6 and Polysix.
UMR-2 is no longer manufactured by Highly Liquid but they made it open source and everything needed to make it is available on Highly Liquid website.


That’s cool!

I don’t need one of these, but if you ever fancy doing a batch of his MIDISpeak boards, I’d be interested.



Interesting. I’ve been thinking about using UMR-2 to midify a (crappy but nice) old Yamaha PortaSound PSS-460.


Hey Modulart,

I’d be interested in entering a new run of UMR2.
It’s been a long time since I wanted to midfy my modded Boss dr-110.

What’s the price and shipping condition on your batch?



Paulus or anyone interested in a prebuilt UMR2 or just a PCB, please PM me.

Bjarne, UMR2 should work with your PSS.

Toneburst, if at least 10 guys are interested in MIDIspeak I can do a batch.


That’s great you are making these available! How about the MIDIWidget?


I ordered a round of boards myself for some synths I’ve acquired secondhand. How are you getting on with programming the microcontroller? Are you using the cradle pcb available on the github or some other method?


I program the PIC using a Pickit3 and a homemade board powered by a 5V regulated AC adapter.

Regarding MIDIwidget, like MIDIspeak if at least 10 guys are interested I can do a batch.


CometBoogers, here is a picture of the setup I use to program the UMR2’s PIC.

It does not look much but it works very well.