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Topic: Need help with OCTAVE Transposing-TIPS anyone? (Read 1219 times) |
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twerp
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MIDI-OX Rules!
Posts: 20
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Need help with OCTAVE Transposing-TIPS anyone?
« on: Apr 27th, 2003, 3:29pm » |
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Hi ALL! I've simplified my system and now just need to find an easy way to transpose: OCTAVEs up and Octaves DOWN.
There's 128 values for notes in midi, right? and keyboards are always less than that. SO, the only way to transpose is to create a note ON and note OFF and do the min/max thing? IS that right?
If I don't get the numbers right I get some pretty strange microtanal type things.
I suppose it would be cool IF someone had already done the maths and had a bunch of charts or something.
ANY help really appreciated.
Have I really missed something?
I often have to use a little 2 octave keyboard so the transoing as easy as poss. thing is important at this point.
AND< I notice that if I do NOT put in the note OFF it doesn't seem to make a differece.... Not yet anyways. Will I always get a problem without the note off value?
THANKS greatly!
Crazy busy here or I'd ramble on some more!!!!
twerp
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Jamie OConnell
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Re: Need help with OCTAVE Transposing-TIPS anyone?
« Reply #1 on: Apr 27th, 2003, 7:16pm » |
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There are indeed 128 MIDI notes, and any MIDI module or keyboard will accept any of those values, even if they are too high or low to make a sound. You need both a Note On and Note Off map, although many keyboards implement Note Off by sending a Note on with 0 velocity. You still need to account for both message types, as not all your data may come from a single keyboard.
You would not get microntonal results because any transformation still results in a discrete note number even if there is interpolation, but you might get non-diatonic transposition if your ranges are not the same width.
To transpose up an octave, you just add 12 to the existing note number to transpose down an octave you just subtract 12. There are some octave transposition maps that are installed with MIDI-OX. Take a look at Transpose Up Octave.oxm and Transpose Down Octave.oxm.
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| « Last Edit: Apr 27th, 2003, 7:17pm by Jamie OConnell » |
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--Jamie
Music is its own reward.
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