reinstallation of 3.2.0-23-lowlatency-pae kernel did also resolve the problem.
both kernels (pae and not pae) now load snd-seq-midi properly !
keyboard works perfectly

thanks a lot to all of you

cheers !

jy

2012/9/18 jy <jypllx@gmail.com>


2012/9/18 Pedro Lopez-Cabanillas <pedro.lopez.cabanillas@gmail.com>
On Tuesday 18 September 2012, you wrote:
> 2012/9/18 jy <jypllx@gmail.com>
>
> > Hi Pedro,
> >
> > This turned out to be a great idea. With a live USB stick of
> > ubuntustudio, my keyboard works out of the box !!!
> > Checked the modules and snd-seq-midi is present with the live USB
> > stick.
> >
> > Rebooted without the live USB stick and I can now confirm that
> > snd-seq-midi is missing whereas it shouldn't be.
> >
> > How can i get it back ?
>
> I'm figuring reinstalling the 3.2.0-23-lowlatency-pae kernel... :-/
> Am I correct ?

Well, yes, I guess. But I'm not an ubuntu/debian user and I don't know the
best way to do so.

I installed another kernel: 3.2.0-23-lowlatency (not pae). Keyboard works out of the box and snd-seq-midi loads perfectly.
 

Another question is: how could it happen in the first place?
I guess some tweaking with the audio configuration. Maybe the installation of my audio drivers since it's the only audio-related operation I did since the install.
Was there an
accident while/after the installation? Or maybe a disk malfunction?
Nope nothing like this....
I would
try to check the filesystem before trying any other repair.
Well since the new kernel solved everything, I think I'm gonna be allright now. I'll do a disk check though. It's a good idea.

I'm also gonna reinstall 3.2.0-23-lowlatency-pae kernel and see if the problem remains...

Regards,
Pedro

Thanks a lot to all of you, you pointed the right direction :)
I always love when the community effort is rewarded with a big SOLVED in the title of thread

I'll keep you posted about the 3.2.0-23-lowlatency-pae reinstall !

Cheers and thanks

jy