sysex messages

[tom adam]

Back in Belgium now and started playing the JD-990. It came expanded 
with the vintage card and it is indeed a nice sounding synth. Although 
it has a very digital sound, but nice to use next to a modular ;-)

I've started some basic work on the arduino, reading encoders, and some 
push buttons and led's.
I can send sysex now too, but have a hard time to combine the sysex with 
incoming midi messages.
I already have a ton of issues that I need to solve.
So some questions:
I plan on using an SPI for the encoders and leds/push buttons. Is this 
the normal way how it's done? I checked the midibox sequencer on how 
it's done there and will probably copy the hardware. What clock speed 
should one read the pots/push buttons?
Do I use an interrupt on the midi incoming signals?

Anyway, seems like it's going to take some time before it's working. So 
in the mean time I plan on using one of these behringer "knob" boxes. 
They seem to handle sysex. Anyone tried this?

Glad to be home, first trip to China that was more of a struggle than 
"fun". I hope I don't have to travel again for some months...

So any post I might have missed that I really should check out the last 
couple of weeks?

Cheers,
ToAd

Op 29-3-2012 12:00, music-bar-request at lists.music-bar.org schreef:
> Message: 3
> Date: Wed, 28 Mar 2012 07:15:00 -0500
> From: James Coplin<james at ticalun.net>
> To: Music-bar<music-bar at lists.music-bar.org>
> Subject: RE: sysex messages
> Message-ID:<661872c36cf624d7912418a9481382d0 at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> You can always program a JD-990 from the front panel of a JD-800 so I would
> just buy another JD800!;)
>
>
>
> The only wrinkle with the 990 sysex (800 for that matter too) is that it
> uses Roland?s checksums for the messages so whatever editor you purchase /
> build will need to be able to calculate it.  Unfortunately that removes a
> fairly large number of commercial editors in particular the Mackie C4.  I
> believe the Behringer does do checksums but someone else will have to chime
> in as I don?t own one.  The Peavey PC-1600x is a great unit (and does
> checksums) and it is trivial to do midi with the Arduino. The fiddle bit
> with the Arduino will be multiplexing the pots if you want a full panel for
> the interface instead of selecting a parameter and then entering values.
>   The 990 is a great sounding machine, make sure you get the vintage synth
> card, and is not difficult to program from the unit.
>
>
>
> James R. Coplin