Developing software for specific MIDI device

I own a Behringer BCR2000 and the device is awesome but the software for it is really horrible. It fails everytime I try to copy a Preset from my computer to the device which is pretty inconvenient to say the least.

I want to develop new simple software for the device (Java or JRuby, since the software was written in Java) but I don't know h开发者_开发知识库ow I would go about doing this.

Would a Java decompiler work?

The first thing to do would be to fire up MIDI-OX and put it in the middle of the software that came with it, and the device. This is often done through loopback drivers such as MIDI Yoke (same site as MIDI-OX).

I wouldn't waste any time at all with the existing software. There will be nothing in there you can't quickly figure out on your own.

Remember that this device can be reprogrammed. It is very flexible. I am assuming you are interested in writing software that sets the presets? Likely you will find the data for this in a SYSEX dump. Again, fire up MIDI-OX and sniff it out.

EDIT: It looks like all of the presets are available already in raw SYSEX data files at http://www.behringer.com/EN/Products/BCR2000.aspx. You can download these and look at them in any hex editor, but MIDI-OX does a decent job of identifying the start and end points of the messages. It looks pretty straightforward, but without the hardware in front of me, it would be difficult to provide an explanation as to which bytes do what.

EDIT #2: Ok, I have figured out some of this. Each message begins like a standard SYSEX message with the byte f0 and ends with the byte f7. The second byte in the message is the manufacturer ID, which Behringer is just using 00 here. Then we get into the message payload, which is all I will show here:

20 32 7f 7f 20 00 00 24 rev R1
20 32 7f 7f 20 00 01 24 preset
20 32 7f 7f 20 00 02 20 .name 'NI Pro 53                '
20 32 7f 7f 20 00 03 20 .snapshot off

And it continues like that. Note that the hex above is actual byte values, but the text is actually ASCII. An odd way of showing it, I know, but I am just trying to illustrate that you have a header. I don't know what the 20 32 7f 7f 20 00 means, but I suspect it means "Hey, update the preset". The next byte seems to be a sequence identifier. The following byte seems to be some command or something. The actual work seems to be in all ASCII from there.

I hope this gets you started. Again, you can find all of this in the preset files. For reference, here is the beginning of file I was looking at:

000000  F0 00 20 32 7F 7F 20 00 00 24 72 65 76 20 52 31  .. 2.. ..$rev R1
000010  F7 F0 00 20 32 7F 7F 20 00 01 24 70 72 65 73 65  ... 2.. ..$prese
000020  74 F7 F0 00 20 32 7F 7F 20 00 02 20 20 2E 6E 61  t... 2.. ..  .na
000030  6D 65 20 27 4E 49 20 50 72 6F 20 35 33 20 20 20  me 'NI Pro 53   
000040  20 20 20 20 20 20 20 20 20 20 20 20 27 F7 F0 00              '...
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000060  6F 74 20 6F 66 66 F7 F0 00 20 32 7F 7F 20 00 04  ot off... 2.. ..
000070  20 20 2E 72 65 71 75 65 73 74 20 6F 66 66 F7 F0    .request off..
000080  00 20 32 7F 7F 20 00 05 20 20 2E 65 67 72 6F 75  . 2.. ..  .egrou
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0000A0  2E 66 6B 65 79 73 20 6F 6E F7 F0 00 20 32 7F 7F  .fkeys on... 2..
0000B0  20 00 07 20 20 2E 6C 6F 63 6B 20 6F 66 66 F7 F0   ..  .lock off..
0000C0  00 20 32 7F 7F 20 00 08 20 20 2E 69 6E 69 74 F7  . 2.. ..  .init.
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I don't think it's necessary to decompile the entire Java application, however you will need to probably wire tap the communication to get an idea of how the computer communicates with the MIDI device. Patches are commonly transfered over MID control signals, which are allowed to be vendor specific and herein lies your problem.

I am afraid I'm unable to provide any further detail though, as I've never attempted a project like this of my own. I hope this small amount of knowledge is at least somewhat useful.

Probably. As long as they didn't use an obfuscator on the code it wouldn't be horrible.

I don't know how to do any MIDI with Java, but I do know that a lot of professional audio MIDI devices document their midi protocol in the manual. You might find it easier to scrap what they did and start from scratch.

Very quick google search led me to here. Didn't really look at it, but it might help.

And taking a quick look at the manual indicates that there's enough midi info to make some educated guesses at what the data would be.

I will say, it's a bit of an undertaking, but it might be a really fun project.

First you need to dump the Sysex files (as quoted with MIDI_OX at start) , then you need to change one parameters by one and find which value has changed in the SysExfile. Of course time consumming ,since manafacturers didn't published the meaning of the payload in the sysex file.