Part of the design of the YC61 and CP1 are that controls and usage is intuitive. Little forum activity can be a sign of success. Not too many problems to bat around. Not too many improvements to request. Sometimes (forum) silence is golden.

Check Soundmondo — that is where you’ll find an active YC61 community. Less questions is, indeed, often a sign of success. It depends on your viewpoint
Check SoundCloud — that is where you can link other YC61 users to your music in your own personal page.

Sometimes forums are like a hospital health clinic, if your not having a problem why would you hang out there?
Go to where the sounds and the music are!

You can even like you YC61 Live Set Sounds on Soundmondo to videos on your YouTube page.
You might also check the Learn area for YC61
Link: LEARN — Yamaha YC61

Puts me right to sleep every time.

Wake up! Join in! Post your stuff, let us hear your sounds, your music, post your video (let’s see what knobs you swapped out on the YC61, lol).
Participate!

If you can’t figure out how to operate something on your YC61, come to the “health clinic”... otherwise: make music!

Maybe there will be some further activity after the next OS update. It's been along wait since April! --
We're obviously not as lucky as those with CP 73 and CP88s (now on their 4th OS update)

Hopefully, Yamaha have been spending the time working on improving the fast speed rotary sim? -- and if it's good it'll have been worth the wait! 🙂

In the meantime I've been trying out my YC61 thru a Neo Vent -- (see here: YC61 - Vent 2 )
Sounds really nice, but is not an ideal set up of course. Here's hoping the next OS update will make the internal sim more like the Vent 2? 🙂