Hi Phil
Happy birthday!!
That looks very nice. I haven't had a play on this particular one but I did see similar devices at a show.
I think if you've written an MML to MIDI converter then you have > zero MIDI knowledge!
I had to check but yours (the 'M' model) does have real or DIN MIDI in, right? (albeit via the smaller TRS socket - that just needs a simple converter for 5-pin DIN and since the MIDI standard requires an optocoupler on MIDI IN, there are no risks there).
That means it could absolutely work with the MIDI version of my sequencer on the RC2014, either via my MIDI module or via some re-clocking shenanigens (MIDI is just serial at a specific baud rate, unfortunately not easily divided from the standard clock rates).
If you'd like to talk about that or my MIDI adaptor, email me directly.
Shiela