Hi I’m in the process of making a preset for the Lexicon MX series devices. Creating a controller with all parameters and program changes is not a big challenge, but parsing the MIDI SysEX is rather a challenge.
I can"t find any decent Sysex implementation description so I need to perform reverse engineering by sniffing into the MIDI streams. Usually via MIDI-Ox
But here is the catch: the MIDI DIN OUT port of the MX200 is disabled. Not in my device alone, but it seems so for all devices, when looking on the internet for testimonials.
The only bidirectional communication left is via USB. Lexicon has an editor for this device, and the interaction between the editor and the MX200 works flawlessly.
However, on my windows PC I can’t find a way to be the man-in-the-middle and intercept the traffic going between the two devices. So I can’t perform the desired reverse engineering.
Anyone suggestionson how to intercept these messages?
(I don’t own an Apple PC, I do have an iPad)
I can’t figure it out. The Lexicon Effects processor itself is visible as USB ‘Lexicon Mx200 Control’, but it doesn’t send any MIDI when tweaking the knobs. And allthough it has a MIDI DIN port labelled ‘Out/Thru’, it’s not outputting anything that way.
Yet, when the Lexicion program ‘MX-Edit’ is started on the PC there is clearly realtime bidrectional communication going on. But as that program has no set up parameters, it is auto-detecting the presence of the MX-200 and it can’t fool it into believe other loopMIDI ports are the ones it should be talking to.
Very frustrating to see a physical device only wanting to talk MIDI and SysEx to an application, but not to anything else.
So putting a man in the middle is not working. Any other ways of looking into a communication stream?
Can you see that (‘Lexicon Mx200 Control’) as a MIDI Interface (on you computer) or is that a general USB Product name on the list of connected USB devices?
I’ll have to buy a mac to continue the work, it seems It is very tedious to work on a PC what with all the port reservations that is continuously intervening between legacy applications, midi-ox and the electra one app.
Also are you sure that the loopbe thing was correctly done? did you use 4 virtual cables?
mx-edit > cable 1 > midi-ox > cable 2 > usb > mx200
mx200 > usb > cable 3 > midi-ox > cable 4 > mx-edit
Oh also the manual says that mxedit should work over midi din as well, did you try that? It might be that the program needs a handshake to start working so better have in and out connected.
Thanks @markus.schloesser .
Some good and bad news: until now I found no evidence from anyone the DIN MIDI OUT is functional. The MIDI thru certainly isn’t.
But perhaps it needs a kickstart as you suggested will try that.
The MX-edit software is simply invisible as MIDI device, so I can’t use the 4 cables, only two (to and from the device). However it got me that far I could see traffic in one way for a short while, which looks like the MX-edit finding out where the device is.
With Lexicon you can find sysex info on their MX300 and MX400, but their internal architecture is quite different, I can see they rearranged parameters making it difficult to efficiently extrapolate it to the Mx200.
This being said, I reached out to Sean yesterday and he responded immediately! he was the guy reverse engineering it, and for sure he came back with his intermediate results it’s not final but I think he might have crossed the hurdle I got stuck on.
So by combining your ideas with his findings, there is light again at the end of the tunnel!
However, today is ‘Ronde Van Vlaanderen’ day, so I’m off going to see Van Aert, Vanderpoel, Pojacar and Pidcock!
The E1 experiments will have to wait a bit longer.
it’s not final but I think he might have crossed the hurdle I got stuck on.