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Eriksimon
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Very odd MIDI corruption issue

Fri Aug 23, 2013 7:58 am

Relevant info: Project originally started in LP 9. First MIDI added in LP X. Similar issue (OP's second issue, with MIDI) described here:
https://discussions.apple.com/thread/5257076?tstart=0

I MIDI recorded a simple chordprogression using an EXS24 piano. It was meant to be and is the first (and only) track with MIDI on it in this project. No hidden tracks, no Melodyne, no MIDI plugins, all Inspector values "virgin", just some MIDI that seems to be weirdly corrupted...
When I played it back some notes totally misbehaved: in a GMaj7 chord, the constituent B note was replaced by a (awfully dissonant) D# note! But the piano roll clearly shows a B note, not a D#. Even when I muted all notes exept the B note, a B note is heard when clicking the note, but when engaging playback, Logic plays a D#!?!?!?

I tried two different EXS piano's and the EP, they all exhibited this weird transposition of one single note.

It was a project started in LP9. I homogenized the velocities and dead-quantized it so the issue would clearly reveal itself, and it did. The issue is that on playback, some notes within chords are (very) dissonantly transposed, but when clicking those "corrupted" notes in the piano roll, the correct note sounds.

Two questions:
1. Wtf?
2. How to repair this?
Attachments
Veryoddmidibug.logicx.zip
(826.59 KiB) Downloaded 49 times
Last edited by Eriksimon on Sat Aug 24, 2013 12:55 am, edited 1 time in total.
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Eriksimon
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:11 am

Bump
Why did the chicken cross the Mobius ring?

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CCTMusic
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:25 am

Hi ES


Just gave this a quick go... cannot reproduce here (LP9.1.8 64, and LPX.0.2)


CCT
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Jordi Torres
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:29 am

I found a fix. Export the region as a MIDI file then re-import it. See attached file.

J.
Attachments
Veryoddmidibug_fix.logicx.zip
(733.48 KiB) Downloaded 119 times
Et voilà!

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Eriksimon
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:35 am

OK, cool Jordi, thanks! So you could hear the issue. Isn't it odd? Have you ever encountered this before?

To CCT: here's a bounce, so you can hear what I heard.
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MIDIBUGBOUNCE.mp3.zip
(441.79 KiB) Downloaded 22 times
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:40 am

Eriksimon wrote:
OK, cool Jordi, thanks! So you could hear the issue. Isn't it odd? Have you ever encountered this before?


You're welcome!

It is indeed very odd. I haven't encountered this issue because I haven't dared to finish any of my Logic 9 projects in Logic 10.

J.
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Eriksimon
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:54 am

Jordi Torres wrote:
It is indeed very odd. I haven't encountered this issue because I haven't dared to finish any of my Logic 9 projects in Logic 10.

J.


Mmmyeah, but the MIDI recording was in LP X, on a track created in LP X, and that guy (from the link in my first post) who had a similar sounding issue did start his project in LP X...
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:57 am

Eriksimon wrote:
Mmmyeah, but the MIDI recording was in LP X, on a track created in LP X, and that guy (from the link in my first post) who had a similar sounding issue did start his project in LP X...


Sorry, I didn't even check out the link...went straight for your project file.

I have no idea why this happens, but if it can be fixed > :D

J.
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CCTMusic
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 12:59 am

Hi

Eriksimon wrote:

To CCT: here's a bounce, so you can hear what I heard.



My early am lack of clarity...

I could hear the "rather nice chords" produced within your project..

what I thought I'd said was.... "I have just created a simple chord progression in a blank LP9 project. I have then opened that project in LPX and it works fine. I cannot reproduce your issue "
:roll:

CCT
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Eriksimon
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 1:17 am

Ah, OK, maybe I was not clear either: I myself cannot reproduce this issue either: I started over, recorded that same progression in the same project and now it sounds fine. (the GM7 chord is g-b-d-f# as it should, not g-d-d#-f# as is heard in the project attached to this topic). However, when I open the veryoddmidibug project, the corruption is still there, as described.

Later addit: it in fact only affects the B2 note, and only in this one project; it gets transposed 8 semitones down to a D#2 - this also happens if I create a B2 note with pencil, or transpose any other note (by dragging in Piano roll or in Event editor) to B2. It is like there's a Transformer set up to alter B2 into D#2 - but there is no such transformer. And if it were a transformer, the B2 should also produce D#2 when clicked, but then it produces the correct note...
Why did the chicken cross the Mobius ring?

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Eriksimon
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Re: Very odd MIDI corruption issue

Sat Aug 24, 2013 5:29 am

To rule out LP9>LP X corruption issues, I deleted all the non-problematic notes from the region, then started a fresh project in LP X from ET (Empty Template), created one SI track, inserted EFM synth (just for variety) and dragged over the region from the original project. The issue persists.
Attachments
MIDItransposebuginLXETproject.logicx.zip
(164.75 KiB) Downloaded 17 times
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Re: Very odd MIDI corruption issue

Sun Aug 25, 2013 6:07 am

...and another report just came in...
https://discussions.apple.com/message/22809462#22809462
Hm...
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 12:20 pm

I don't get why this topic was closed... the bug just happened to me again... with an LP X started project... a true ghost note, or: how one A4 note can also be a G#1 note... :? :? :?


Click the A4 note, you'll hear an A4. Let Logic play it back, and you'll hear a G#1.

wuttuf?
Attachments
Haunted MIDI.logicx.zip
(1.63 MiB) Downloaded 15 times
Why did the chicken cross the Mobius ring?

miMac Intel C2Q 2.5 GHz 4 GB RAM/OS X 11.6 (El Capitan)/Logic Pro X 10.2.4/MXL 990/Edirol UA-4FX/E-MU XBoard 49/Studiologic CMK 149/Akai LPD8
 
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Jordi Torres
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 12:27 pm

Eriksimon wrote:
I don't get why this topic was closed...


This topic hasn't been "closed". Simply, a solution to your specific problem (or workaround, if you prefer) was found.

If you want to open a thread in the Logic Pro X Bugs & Workarounds forum, including the steps to reproduce the bug, please go ahead.

J.
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Eriksimon
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 1:10 pm

Jordi Torres wrote:
Eriksimon wrote:
I don't get why this topic was closed...


This topic hasn't been "closed". Simply, a solution to your specific problem (or workaround, if you prefer) was found.


OK, 'closed' was the wrong word, I actually meant "marked solved", not closed - if it were closed, I wouldn't be able to post in it.

Jordi Torres wrote:
If you want to open a thread in the Logic Pro X Bugs & Workarounds forum, including the steps to reproduce the bug, please go ahead.

J.


"Including steps..." you know very fair well that this issue is not that kind of issue. It's a NEBuNeSoN (Non-Existing But Nevertheless Sounding Note).
Also, I only start posts in the B&W forum if I have found something that is reliably reproducable with a few simple steps, and this isn't; this is more a case of awaiting further spontaneous occurances/reports. Apparently, as with so many super- or supranatural phenomena (Yeti, Chupacabra, Loch Ness monster, God) it rarely/never lets itself be caught by a scientific approach. What's needed here is a ghostnote-whisperer.

But, if xmota and I are the only ones suffering this, I guess we two just have some very specific shared bad karma...
Why did the chicken cross the Mobius ring?

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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 1:24 pm

Eriksimon wrote:
OK, 'closed' was the wrong word, I actually meant "marked solved", not closed - if it were closed, I wouldn't be able to post in it.


Exactly. But I think I did find a solution to your problem, didn't I?

Eriksimon wrote:
"Including steps..." you know very fair well that this issue is not that kind of issue. It's a NEBuNeSoN (Non-Existing But Nevertheless Sounding Note).


OK, fair enough. But being some sort of bug, what else do you want us fellow Logic users to do about it? Or is this all about the "[SOLVED]" label on the thread?

J.
Et voilà!

Mac mini i7 2.3 GHz - 16GB RAM | OS 10.11.6 | Logic Pro 10.2.4 | Logic Pro 9.1.8 |
MacBook Pro 15" Retina i7 2.2 GHz - 16GB RAM | OS 10.11.6 | Logic Pro 10.2.4 |
Dead MacBook Pro 15" Core 2 Duo 2.2 GHz - 6GB RAM | OS 10.6.8 | Logic Pro 9.1.8 |
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Eriksimon
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 1:25 pm

O BTW to thicken the plot and to at least show some repeatability, at least in my attached project file: if you delete the offending note (A4) and then use the pencil in the piano roll to put in a new A4 note, or if you step enter a new A4 note, it exhibits the same two faces: A4 on clicking, G#1 on playback.
Last edited by Eriksimon on Sun Sep 22, 2013 1:47 pm, edited 1 time in total.
Why did the chicken cross the Mobius ring?

miMac Intel C2Q 2.5 GHz 4 GB RAM/OS X 11.6 (El Capitan)/Logic Pro X 10.2.4/MXL 990/Edirol UA-4FX/E-MU XBoard 49/Studiologic CMK 149/Akai LPD8
 
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Eriksimon
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 1:45 pm

Jordi Torres wrote:
Eriksimon wrote:
OK, 'closed' was the wrong word, I actually meant "marked solved", not closed - if it were closed, I wouldn't be able to post in it.


Exactly. But I think I did find a solution to your problem, didn't I?


Well, yes (thanks!), and also no, as I think the real problem is that this is happening in the first place. If my text editor occasionally replaced w's with k's, it would seriously undermine my faith in the developers of such an application and I would not use it for long, and this is pretty much comparable. The only "advantage" of this , eh, bug/glitch, glugbitch? is that the ghost note is wildy off scale. If they happen to fall within the tonic or scale, they may even go unnoticed.

Jordi Torres wrote:
Eriksimon wrote:
"Including steps..." you know very fair well that this issue is not that kind of issue. It's a NEBuNeSoN (Non-Existing But Nevertheless Sounding Note).


OK, fair enough. But being some sort of bug, what else do you want us fellow Logic users to do about it? Or is this all about the "[SOLVED]" label on the thread?


Yeah, I think it is, because 'solved' to me would mean: "the devs have recognised it, repaired the faulty coremidiengineframeworkbundlebitcode, and this is no longer an issue in 10.0.4." ;) Couldn't it be marked [+ workaround] or something simlar?
Why did the chicken cross the Mobius ring?

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Eriksimon
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Re: Very odd MIDI corruption issue

Sun Sep 22, 2013 2:02 pm

A different workaround I just discovered: I transposed the notes down an octave in the piano roll, and then set the region transpose parameter to +12 and this also excorcised the G(hostly)#1.
Why did the chicken cross the Mobius ring?

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Re: Very odd MIDI corruption issue

Tue Jun 03, 2014 12:19 am

I was working on some chord inversions when I ran into this debilitating bug. Suddenly the 5th in an E major was literally in another key. I followed the above fix and when I re-import the region I can play around with it as normal and the problem is gone. Thanks for the work around Jordi!
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