Yamaha DTX450K + iConnect Midi Controller + Madcatz Midi Pro to Xbox 360 (Headset Issue) Rock ...

I try to play everyday, but it gets kind of boring playing solo. And it's hard to find people with DLC, and that won't quit when a song is picked they don't want to do. On top of that it seems I always connect with people that just want to do thrash music...
I am very eclectic when it comes to music and don't want to be "stuck" doing just one style of music, which is why I wind up playing solo.

I think I have around 400 songs. I play drums on hard (Pro Mode) on a Yamaha DTX 450K set. I had to use an iCONNECT MIDI device to get these to work with Rock Band 3, and have no headset/voice capability with it. So if we play together, know ahead of time
that I cannot communicate in game with you. Unless someone has a way to get around this. (not willing to buy a second LIVE account btw to do it).

If you send me an Invite, put ROCK BAND 3 in the message, or RB3, so I know. (I don't respond to random Friend Invites)

It's been a while since I setup a keyboard for RB3. But ultimately, you need to have the midi controller that came with rockband 3 in order to use a midi keyboard. Or if it didn't come with your bundle, buy it separately, they are about 20-30 bucks new.

You'll need to midi pro adapter buddy,
LINK, so it's keyboard to adapter to xbox

Follow-up discovery after some messing about,

I was able to use the controller as normal when I got home from work yesterday. Had the disconnect issue almost immediately after starting BF2. I unplugged and turned off the controller and I used my midi-controller to exit the game and log out my profile
and restart the game then the normal controller would work. That's really weird that shutting the console off wont have the same effect. If I didn't have that rock band midi controller I'd apparently have to wait a day to play again. Just exiting the game
and logging out isn't enough to complete the process, I have to restart the game to get the controller to work. Weird...

It's a joystick/ MIDI port

They will not work. Only whitelisted sticks work with the adaptive controller, which includes the logitech 3D pro

15 pin joysticks typically don't even have driver support for current windows, and haven't for a long time

Compatible accessories

https://www.xbox.com/en-US/accessories/controllers/xbox-adaptive-controller