Merging a MIDI Note stream with a CC 7 value from 2 apps

mcdtracy
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Posts: 28

Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 6:10:48 GMT

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Post by mcdtracy on Apr 19, 2019 6:10:48 GMT

I have a MIDI Stream coming from an App call FAC Envolver. It's configure to send the envelope of the microphone out constantly
and when the envelope exceeds a threshold it sends out a MIDi Note On & Off Pair. I'd like to insert the CC7 value into the MIDI Note
ON's Velocity setting which gets locked in at 127 without this requested change to the Stream. Can I see a Script to do this? I next CC7 after the
NOTE ON should be good for the Velocity "re-write" on the outbound MIDI NOTE ON.

The use case is to use the iPad Mic to make a MIDI Drum trigger for MIDI Drums. With this change I'll be able to hear accented notes on a snare drum
or loud vs soft cymbal crashes.

21036: CH1 CC 7 1
21036: CH1 CC 7 1
21036: CH1 CC 7 1
21036: CH1 CC 7 1
21036: CH1 CC 7 3
21036: CH1 NOTE ON 36 127
21036: CH1 CC 7 24
21036: CH1 CC 7 28
21036: CH1 CC 7 28
21036: CH1 CC 7 27
21036: CH1 CC 7 24
21036: CH1 NOTE OFF 36 0
21036: CH1 CC 7 19
21036: CH1 CC 7 15
21036: CH1 CC 7 15
21036: CH1 CC 7 12
21036: CH1 CC 7 10
21036: CH1 CC 7 8
21036: CH1 CC 7 7
21036: CH1 CC 7 6
21036: CH1 CC 7 5

Last Edit: Apr 29, 2019 21:38:14 GMT by mcdtracy

nic
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Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 7:07:39 GMT

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Post by nic on Apr 19, 2019 7:07:39 GMT

Hi mcdtracy ,

Maybe something like this:

if LOAD
ASS L0 = 0 # init array
END

9X XX 00 = 8X
IF MT == 90
# note on - remember and block it
ASS L0 = M0 M1
XX = XX +B
END

IF M0 == B0 07
# got cc7
IF L0 != 0
# we have queued note, send it
# with CC's value as velocity
SND L0 L1 M2
ASS L0 = 0
END
END

Regards, Nic.

mcdtracy Converser Posts: 28	Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 16:25:53 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by mcdtracy on Apr 19, 2019 16:25:53 GMT Thanks. I'll give it a try.

mcdtracy
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Posts: 28

Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 19:24:52 GMT

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Post by mcdtracy on Apr 19, 2019 19:24:52 GMT

Yes. It works great. The next CC 7 value becomes the MIDI NOTE ON velocity. In practice with FAC Envolver this turns out to track the Threshold setting for the NOTE ON's.

A nice update to the script would be to change 2 things:

1) Filter Out all CC's and just use them to capture the Volume value. The drum app doesn't need to see those CC's... just NOTE ON and OFF.
2) Capture the PEAK CC value after the NOTE ON event so the Drum sees Accents in the audio transients and the MIDI NOTE ON stream varies in volume.

Thanks, Nic. This script might motivate a few more StreamByter sales. FAC Envolver intends to add this behavior to an update but who knows how long that will take.

I'll share a drum solo when the accents are working. Until then this script just gives me some control over volume which I was using "MIDI Curve" to provide.
Changing the CC's to track the peaks will allow me to play the "WipeOut" tom-tom solo or Gene Krupa's "Sing, Sing, Sing" tom-tom swing riff just by tapping on the iPad case.

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Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 19:47:17 GMT

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Post by nic on Apr 19, 2019 19:47:17 GMT

Hi mcdtracy ,

Blocking the CC is easy. Just add XX = XX +B just before the last END (or in the next update, hopefully next week, use the BLOCK keyword instead along with more readable equivalents of the hated 3 character rules ;-) )

I will get back to you on the peak. It will of course delay the note on until just after the peak is reached, although maybe I'm not understanding exactly what you are looking for.

Regards, Nic.

Last Edit: Apr 19, 2019 19:49:13 GMT by nic

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Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 19, 2019 21:54:02 GMT

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Post by nic on Apr 19, 2019 21:54:02 GMT

Hi mcdtracy ,

and here is the peak+block version... think this should work

IF LOAD
ASS L0 = 0 # init array
END

9X XX 00 = 8X
IF MT == 90
# note on - remember and block it
ASS L0 = M0 M1
XX = XX +B
END

IF M0 == B0 07
# got cc7
IF M2 < L2 # CC value dropped from previous
IF L0 != 0
# we have queued note, send it
# with previous CC's value (peak) as velocity
SND L0 L1 L2
ASS L0 = 0
END
END

# remember CC value for next time
ASS L2 = M2

# block CC
XX = XX +B
END

Regards, Nic.

mcdtracy Converser Posts: 28	Merging a MIDI Note stream with a CC 7 value from 2 apps Apr 20, 2019 4:33:41 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by mcdtracy on Apr 20, 2019 4:33:41 GMT It works great. It's tracking accents in the audio input. I shared in on the AudioBus Forum to recruit Drummer's to use StreamByter.

Merging a MIDI Note stream with a CC 7 value from 2 apps

Post by mcdtracy on Apr 19, 2019 6:10:48 GMT

Post by nic on Apr 19, 2019 7:07:39 GMT

Post by mcdtracy on Apr 19, 2019 16:25:53 GMT

Post by mcdtracy on Apr 19, 2019 19:24:52 GMT

Post by nic on Apr 19, 2019 19:47:17 GMT

Post by nic on Apr 19, 2019 21:54:02 GMT

Post by mcdtracy on Apr 20, 2019 4:33:41 GMT