Emu XL-7 & MP-7 User's Group

Hey Everybody,

I'm not really a regular here, but I do check in every once in 
awhile.  I've been having this really weird problem, which I'm 
*pretty* sure is related to my MP-7, but I'm not exactly sure.  Let 
me describe it to you folks, maybe you can figure out what's going 
wrong!

I'm using an ASUS A7N8X Deluxe motherboard with an Ahtlon XP 2600+ 
chip with 300mhz FSB.  512 megs of RAM, WD Caviar 8mb Cache 120gb HD, 
and an M-Audio Delta 10/10lt soundcard.
Recently, I've been trying to learn how to use Cubase SX with Reason 
(utilizing Rewire, of course).  I have the delta's midi in/out hooked 
up to my MP-7, and my MOBO's onboard MIDI connector (joystick port) 
to connect to my keyboard.  I've been trying to play things on the 
keyboard and have them be recorded on the MP7.  This worked fine for 
the first track I recorded, Track 16 (I already have some drums 
recorded on 1-8).  I did this by using Cubase's midi thru function, 
essentially creating a midi track with my keyboard as the input and 
mp7 as output.  But then I have tried a couple of times to record 
another track (Track 15), and something goes wrong.  For some reason, 
the mp7 records the notes I play, but doesn't register key-offs!  
That is, it's as though I have a sustain pedal pushed down for my 
entire track 15.  To verify this, in Cubase, I created a midi track 
with the mp7 track 15 as input, and a reason synth as output.  When I 
hit the keys on my mp7, they triggered the note, but again, when I 
let OFF the key, the note didn't turn off!  And if that wasn't weird 
enough, I started trying all the different keys in different octaves, 
and SOME keys behaved correctly, although MOST keys did NOT!  Out of 
curiousity, I started testing the other tracks on my mp7, and they 
were all similar!  Some keys worked properly, some did not.  No 
correlation that I could tell between tracks or octaves.

Other than that, my MP7 has always worked perfectly.  I swear it's 
the best investment I've ever made!  But this problem is weird and I 
have no idea what to do...  it's prolly some stupid midi thing that 
I'd never think of!  ArggghHhH!

All help is greatly appreciated!  Thanks VERY much!

-Steve