Here's what I searched for (using a search engine, not this site's search feature):

site:yamahasynth.com roli montage

... and here's what I got:

https://www.yamahasynth.com/forum/roli-to-montage
https://www.yamahasynth.com/forum/midi-controller-direct-connection-to-montage
https://www.yamahasynth.com/forum/montage-and-mpe/latest
... a parts 9-16 one
https://www.yamahasynth.com/forum/parts-9-to-16

The users who seem to be actively using the Roli are:

https://www.yamahasynth.com/forum/profile/1294 (MICHAEL TRIGOBOFF) and
https://www.yamahasynth.com/forum/profile/6864 (CHRISTINE) and
https://www.yamahasynth.com/forum/profile/5600 (DAVID)

Hi, simply use the search function on top forum section with "roli".

It's Chrstine who have a roli keyboard.

https://www.yamahasynth.com/forum/parts-9-to-16#reply-20647

https://www.yamahasynth.com/forum/roli-to-montage

She made a video in connexion with Montage :

https://www.youtube.com/watch?v=dXg_cEjWsBM&t=1s

I'm also interesting with seaboard block + "iConnectMIDI4+" from iconnectivity but at this step i'm not sure what i can control really with it. The Rise 25 is too expensive for my using.

Thank you!

I keep meaning to update my blog & video about it, I've got some quite nice FM-X parts in 9-16 now. When I get time....

I just have tried the Seaboard 5D app on my ipad connected thru the Montage by the UD-BT01, work fine to control and test the Roli app sounds.
howether you cannot control the Montage thru the app to test what controllers you can take in count.

Hope the Blocks dasboard app can help with edit and select some good CC in combinaison with Montage.

Thank you Christine, we stay tuned 😉

I started playing Yamaha with the YC-45D combo-organ. Way back with the Crazy Horses of the Osmonds. It had after-touch by which you could apply tremolo by
vibrating your finger left-right, like a violin player does.

Sometimes I see youtube demo´s where people are still used to do this. I myself sometime do this automatically, although I know it doesn´t produce any effect like that anymore on the Montage. It would be great to have that back, instead of hooking-up a Roli.

Keyboard player David KBD from Spain does apply this when mimicking lead guitars using the pitch-bend wheel. Whether you like this metal rock or not it´s worth seeing his technique. He has video´s using Motif and more recent Montage.
https://www.youtube.com/watch?v=hiKU_rrYmgE&list=PLCydo_2Ov37ZrygN-meh6mtwhBPMPIhp1&index=2