Hi :) a short question.
Sorry Rui, sorry list, but while there are a vast number of sides that discuss and try to solve troubles with MIDI when using modern computers that run Windows or MacOS, for Linux I only found stupid prejudices about the MIDI standard, no serious discussion, no trouble shooting. I'll start a trouble shooting list. "If this or that happens, the course might be this or that." Has anybody experiences with MIDI by USB and MIDI by D-Sub MPU-401? What is the more stable interface for Linux? Cheers, Ralf PS: Some days ago I started a real song, not a test song and Linux still seems to be unusable for a mix of MIDI and audio recording work, just doing MIDI, even with external equipment is fine, even if there is jitter. Jitter "only" becomes a problem after recording some external MIDI equipment and that recordings need to be in sync with external MIDI equipment, this even makes little jitter that can't be heard as an early reflection like effect becoming a problem. I heard by some (what I call) professionals (because they have experiences with MIDI), that troubles are well known for Windows, while nobody ever heard of any working Linux! The only software for modern computers that should make less trouble, but it still should make trouble too, should be Nuendo. I don't know if it's true or not! While someone on a Linux mailing list wrote that USB MIDInterfaces should be less good than D-Sub MPU-401, I read in the world wide web, that someone wrote USB MIDI should be the better choice (I guess he referred to Mac and Windows). I don't know what's the better solution, I still guess MPU-401 explicit by on-board gameports seems to be better for Linux and Windows, than USB MIDInterfaces. I wondered that my gameport MIDI cable didn't work with my Terratec, even after I soldered different versions. Then Rui informed about missing opto-couplers. The opto-couplers are just for galvanic isolation and only for MIDI in, so I was leery if opto-couplers will solve my trouble. Today I visited a friend and got some CNY17 opto-couplers, back at home I started studying different MIDInterfaces and D-Sub to MIDI solutions. Instead of reading the whole http://www.harmony-central.com/MIDI/sbmidi.txt in a foreign language, I preferred this circuit diagram: http://upload.wikimedia.org/wikipedia/de/thumb/5/53/StandardMIDIInterface.gif/672px-StandardMIDIInterface.gif Some circuit diagrams show the 7404, 74xy4049, resp. 4049 chip, so I don't need to test if the opto-coupler will solve my trouble ;), it's sure that it can't do that. For MIDI out "boost" is needed, done by e.g. a 4049. A MIDI thru box I made in the 80ies not only is using stuff similar to that chip, but it also has a potentiometer to adjust in and/or out. Diodes and resistors in the data line have some technical issues for network connections and antenna wiring, I guess among other things, they avoid echo effects. I might be wrong. Anyway, it might be that a lot of MIDInterfaces for Linux and Windows are build without diodes and resistors in the data line. I'm able to imagine that experimental software and cheap hardware might be an unlucky combination. I still fear that there is a special wiring for the Terratec EWX24/96 D-Sub, because MIDI in should also work without galvanic isolation ;), but it doesn't for the Terratec :(. I dig out the old joke, the breadboard, to do a test wiring, but now I'm missing the 4049 :(. We don't have any electronic shops, I only can order stuff, when I reach a minimum order value and I guess the friend I visited today also has some 4049, but nobody knows when he and I have time to meet each other again. That makes me think, that a trouble shooting list is something that is needed. _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
