I assume you mean the official Yamaha Synth forum and not Yamaha Forums?
There is a certain mod on Yamaha Synth who cannot take any criticism of any synth of theirs. His stock response is usually along the lines that you are basically too stupid to understand the brilliance of Yamaha.
If I treated my customers like this, I would be fired.
I am a long time Yamaha fan (EX5, SY99/SY77, FS1r, AN1x and a few others along the way) and I have the same criticism on the Montage, it has a really stupid MIDI implementation that makes it hard to integrate in a multi synth setup (esp if you do not want a computer on stage). Compared to the features on the EX5 and MOTIF in terms of external MIDI control it is a step backwards. In later OS releases they introduced Zone Master, so fine if you want to control external gear, but absolute rubbish if you want to control several Montage parts from an external single MIDI channel (e.g four layered performance parts). Basically you can’t as the receive channels are fixed. As a software engineer, I know that that would be pretty trivial to fix…
I have long held the view that Yamaha must have a “stupid quirks” department, in that no synth can be unleashed on the public unless it has a stupid quirk or two.
In the EX5 it was putting in a limitation that stopped a 16 part Multi-timbral performance from being able to play any more than two “layers” from the keyboard. Yet you could get around it by routing MIDI out to MIDI in!
The FS1r has a really amazing engine bit a) it is tortuous to program through its user interface, and Yamaha introduced a brilliant concept in FSEQs but then never released an editor for it!
PLGs - great concept, but you cannot program them from the front panel of a synth and you cannot read their contents - you have to dump content to them from an external editor, but they lose their content when you power off, unless you get the synth to save their content (which means that the content can be read…).
This MIDI problem that you describe in the Montage is its stupid quirk, which Yamaha are being lobbied to fix.
I have also posted on Yamaha Synth to say it is a pretty dumb limitation, but I am not worried about it, due to this wonderful software called Cantabile.
Basically I just leave the Montage in single mode, and have Cantabile to do any MIDI routing/mapping to/from the Montage. Works a treat
The other stupid quick in my view (and for which I was told that I did not understand the Montage) is that you can select a live set bank and live set slot via MIDI, but you cannot select a live set via MIDI (no problem with my Kronos).
So, I have live sets for general use, one for Welsh Floyd, one for my electronica music, etc. I have corresponding set lists in Cantabile, and when I select a song, I want the right live set to be selected. Currently I have to do that manually at the start of a gig. Not a biggie, but one more thing to forget… So I am lobbying for that as well.