You might recall the MIDI to JX-3P Protocol Converter from Xonik Devices posted back in 2015 here. Xonik Devices wrote in to let us know they have a new converter kit. Details follow.
"Hi everybody! Five years ago I made a small device that translates midi CC messages into the proprietary format that the Roland PG-200 uses to control the JX-3P, MKS-30 and GR-700, making it possible to tweak parameters on these synths without the rather expensive PG-200.


an enclosure. I've got enough parts for 40 kits at the moment, sold on a first come first served basis. If demand is high I will probably order more parts, but there is a bit of a lead time.
If you want to order one, have any questions or just want to contact me, go to:
https://www.xonik.no/mpg200
PS: I do this on a hobby basis so it may take me a few days to get back to you!
About the MPG-200:
The MPG-200 is an affordable replacement for the PG-200 synthesizer programmer. It is a protocol translator for vintage Roland synths that use the PG-200 - JX-3P, MKS-30 and GR-700. It translates standard midi CC-messages into the proprietary PG-200 format necessary to control the synths, making it possible to use a DAW, hardware midi controller or other synth in place of the expensive PG-200.
No internal modification of your synth is necessary, as the MPG-200 does a direct translation into the PG-200 data format.
The MPG-200 comes with Midi thru, so you don't have to use a splitter if you want to control both playing and parameter noodling of your MKS-30 from the same midi source.
The MPG-200 is configurable and upgradable through Midi.
Read more about the MPG-200 at https://www.xonik.no/mpg200 and builders-guide"

here is an unboxing of the earlier unit v1.1
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here is a earlier unit v1.1 assembed
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this is a video of the latest version 6.1 unboxing
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here is a video of version 6.1 assemble and testing.
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If you create a playlist I'll add it to the post. You can reply with the link here and I should get it.
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