[LAD] [LAU] So what's the deal with controlling the aeolus organ?stops via midi

Ralf Mardorf ralf.mardorf at alice-dsl.net
Tue Oct 6 20:58:05 UTC 2009

Pedro Lopez-Cabanillas wrote:
> On Monday, October 5, 2009, Fons Adriaensen wrote:
>> On Mon, Oct 05, 2009 at 07:00:40PM +0200, Pedro Lopez-Cabanillas wrote:
>>> The MMA requires that you use a registered manufacturer ID, but only for
>>> commercial products. There is a special ID = 0x7D that is intended for
>>> educational or development use only, and should never appear in a
>>> commercial design.
>> Where it is silently assumed that 'educational' and 'development'
>> implies 'not distributed', or at least 'never used together with
>> any other app using the same ID'.
>> If two or more open source programs use 0x7D and they happen to
>> see the same MIDI stream then one of them will be screwed.
> The only devices or programs that would be screwed are those bad or poorly 
> designed/written.
> In addition to the manufacturer ID, there should be enough additional bytes to 
> uncertainly identify a particular model among others using the same 
> manufacturer ID. The device (soft in this case) receiving a message should be 
> able to distinguish between legitimate and spurious messages using the model 
> ID bytes, checksums and/or some other mechanism.

Checksums are not always used for simple parameters, I guess they are 
used for complete dumps and the model number or device number also could 
have a FLOSS-twin. For e.g. the Matrix-1000 you can have several 
Oberheim Matrix-1000 and give them device numbers, so that only one 
Matrix-1000 will use received data. It would be really good if there 
would be a first ID for FLOSS, but there isn't, so it might be the best 
way to make this ID changeable by the GUI.

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