Well, I use a lot of MIDIs found online for preparing hymns for my 
church. I think a lot of those MIDIs weren't exactly recorded by the 
best instrument player.

My own MIDI recordings are difficult to clean up. (Not that I'm a great, 
"currently practiced up to my old skills" keyboard player.) But I often 
think that MIDI's timing resolution is far more precise than that of any 
human. So the duration of a recorded quarter note isn't the precise 
960(?) that Rosegarden (might?) define it as. Then the quantizer gets to 
try to figure out just how to handle something simple like the end of 
the note. How far does the actual recorded note extend before the 
quanitzer decides it's supposed to be a quarter note tied to a following 
note?

Then toss in the apparent fact that Rosegarden really doesn't handle 
MIDI tracks with 2 contrapuntal melodies on a track.

Quantization does seem to help situations where the bar lines Rosegarden 
shows when importing a recorded MIDI - you know, where somehow more 
beats end up in a measure than belong there?

I don't know, but with recorded hymn MIDIs, I've often found it faster 
to just put in the notes in the score view than to try to clean things up.

One thing I find annoying about MIDI. Absolute time. Meaning a note that 
on a score should play right here on beat 2 of measure 4, somehow got an 
absolute time that puts it in some other measure entirely. I'm sure 
there was a reason for this in the MIDI standard, but it bugs me!

On 01/01/2017 04:01 PM, Ray Klassen wrote:
> Ha ha. What a relief. I've tried to use grid quantize on midi files i've
> pulled down off the net and like users the world over I thought it must
> be something wrong with me.
>
> On Jan 1, 2017 3:56 PM, "D. Michael McIntyre"
> <[email protected] <mailto:[email protected]>>
> wrote:
>
>     On 12/31/2016 06:43 PM, Ray Klassen wrote:
>
>         PS You're right. I would have expected magic from the grid quantize.
>         what is it doing if it's not doing this?
>
>
>     Damn if I know.  I've never been able to figure it out from
>     observing the results, and I've never actually looked into that code.
>
>     --
>     D. Michael McIntyre


-- 
David W. Jones
[email protected]
authenticity, honesty, community
http://dancingtreefrog.com

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