Fade NRPN

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ataylo...@orcsd.org

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Feb 2, 2016, 5:55:31 PM2/2/16
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Hello,

I'm trying to figure out if it's possible to fade NRPN MIDI messages, or if I'm going to have to cue a whole bunch of them to increment.  I have the MIDI cue working, but don't see a way to fade it.  I remember seeing some discussion about MIDI fading recently, but didn't follow it closely.

Thanks,
Alexander

Rich Walsh

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Feb 2, 2016, 6:09:02 PM2/2/16
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I think it works like this: you send CC99 followed by CC98 to set which parameter you are adjusting, and then send CC6 (for coarse control) and optionally CC38 (for fine control). Until you send CC99 & CC98 again, anything you send on CC6 & CC38 should affect the currently selected parameter. MIDI Cues include the ability to fade certain command types (in particular CC) to a value.

By "the MIDI cue" you presumably mean "the 3 MIDI cues" (or "the 4 MIDI cues")? If so, then use the built-in fade on the 3rd cue to do coarse fading. Fine control fading would be really tricky as you'd have to increment the coarse control after each fade…

Rich

Alexander (Mailing List) Taylor

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Feb 2, 2016, 6:31:30 PM2/2/16
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Ah I see.  I’m only using one cue right now sending as SysEx, so I should split it out.  Got it, I’ll give that a try.

Thanks,
Alexander

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Alexander Taylor (Mailing List)

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Feb 2, 2016, 8:31:02 PM2/2/16
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That worked quite well!  I ended up only using 2 cues, the first was SysEx of the first two sections of the message from the iLive MIDI spec, then the last one I used a CC MIDI with the fade.

Thanks again,
Alexander

Rich Walsh

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Feb 2, 2016, 8:39:08 PM2/2/16
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I would consider that a bit of a bodge: you're not sending SysEx, you're using QLab's ability to take any hex strings in a SysEx message to send a SysEx status byte followed by a CC status byte, which causes the SysEx message to abort  An F7 will then turn up later to mark the end of the SysEx message, and be treated as an error.

It may never cause you any issues, but you should be aware that you're bending the protocols a bit – just in case this approach doesn't work with a different setup (eg: you stick a MIDI merge in line, and the partial messages confuse it).

Rich

Alexander Taylor (Mailing List)

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Feb 2, 2016, 8:40:50 PM2/2/16
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Interesting, I’ll have to change that tomorrow when I have more brain power.

Thanks again,
Alexander

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