> From: David Olofson <[email protected]> > These issues seem orthogonal to me. Addressing individual notes is just a > matter of providing some more information. You could think of it as MIDI > using > note pitch as an "implicit" note/voice ID. NoteOff uses pitch to "address" > notes - and so does Poly Pressure, BTW!
Not exactly note-pitch. That's a common simplification/myth. MIDI uses 'key-number'. E.g. key number 12 is *usually* tuned to C0, but is easily re-tuned to C1, two keys can be tuned to the same pitch yet still be addressed independently. It's a common shortcut to say MIDI-key-number 'is the pitch', it's actually an index into a table of pitches. Synths can switch that tuning table to handle other scales. A MIDI note-on causes a synth to allocate a physical voice. That physical voice is temporarily mapped to that MIDI-key-number so that subsequent note control is directed to that voice. The mapping is temporary. Once the note is done the mapping is erased. Playing the same key later will likely allocate a different physical voice. The MIDI-key-number is therefore an 'ID' mapping a control-source to a physical-voice. > Anyway, what I do in that aforementioned prototyping thing is pretty much > what > was once discussed for the XAP plugin API; I'm using explicit "virtual > voice > IDs", rather than (ab)using pitch or some other control values to keep > track of notes. I agree that addressing notes unambiguously regardless of pitch (or any other arbitrary property) is the ideal. I wish more sequencers were not locked into a narrow 'western pop music' mode of operation. But many MIDI alternatives have been proposed without looking deeply enough to realise that MIDI already supports very flexible note control. MIDI's significant flaw is it's grossly outdated 7-bit resolution, the underlying voice model is sound. > Virtual voices are used by the "sender" to define and > address contexts, whereas the actual management of physical voices is done > on the receiving end. You have re-invented MIDI with different nomenclature ;-). Best Regards, Jeff McClintock _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
