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

I have just figured out the Single Note Tuning Change problem. The 
manual is in error. It documents the message as a Midi Universal Non-
Realtime message (0x7e) when it should be Universal Realtime message
(0x7f). I have documented both these bugs in the SysExFaults file in 
the P2K group file section.

Thanks for the help, I thought I was cracking up for a while there.
Keith

--- In xl7@yahoogroups.com, "Keith Young" <emigr8@...> wrote:
>
> Its very strange. I am also seeing the values change depending on 
> manual adjustments in the front panel. But when I come to actually 
> trying to calculate from scratch, I never get the same value as 
they 
> do. I have tried every combination of the first 6 bytes (the 
header), 
> both with and without including the name, either XORing or ADDing 
and 
> trying additional subtraction from 0x80 or XORing the result with 
> 0x7f. So I went back to my standard routine and tested it on a non-
> Emu module and it worked fine. In then end I found that if I set 
the 
> checksum to 0x7f it works. It shouldn't, but it does. I think it's 
a 
> bug.
> 
> As for the Single Note Change, it is doing nothing for me. I would 
> expect to be able to send it and get an immediate effect when I 
play 
> the note (I don't). If I send a whole table, it works fine.
> Keith
> 
> --- In xl7@yahoogroups.com, "steve_the_composer" <smw-mail@> wrote:
> >
> > Just did a quick test as follows [on XL-2500]:
> > 
> > (1) On C-2 of USer Table 1 I changed coarse to 127 and fine to 63.
> > (2) I requested table 1: f0 7e 00 08 00 00 f7
> > 
> > Here's the first part of the dump:
> > 
> > F0 7E 00 08 01 00 [header]
> > 55 73 65 72 20 54 75 6E 69 6E 67 20 30 30 30 20 [name]
> > 7F 7E 00 [C-2]
> > 01 00 00 [C#-2]
> > 
> > (3) I then changed C-2 back to its original
> > 00 00 00
> > 
> > (4) Since I added 03, I subtracted 03 from the check sum.
> > 37 became 34
> > 
> > (5) I then sent the dump back and since I had the table up
> >  on display, I saw the 127 and 63 change back to 000 and 00.
> > 
> > I imagine the other P2Ks should work the same way.
> > 
> > BTW, I seem to recall on the P2K message board a few of us 
> discussed 
> > tuning systems. This was a year or two ago.
> > 
> > I will check out the single note change.
> > 
> > --Steve
> > 
> > PS: My checksum calculation (Roland gear) was either for the 
> > Commodore 64 or the Intel 8086/8088 and may have been in assembly 
> > lang. I would have used an 8 bit variable, shifted left, then 
right 
> > to drop the 8th bit and finally subtracted from 80h. If I ever 
find 
> > the code, I will check to see if I used the XOR.
> >
>