[Ardour-Users] Ardour 5.6 moves MIDI notes to the left?

[Mirko Horstmann]

Ok, 5.6.22 seems to move notes only a little, I guess it's now properly 
adjusting for latency (or shouldn't it do any of that with the 
adjustments set to 0 samples?)

On 15.02.2017 09:39, Paul Davis wrote:
> Talking with another of our developers, there was a bug in 5.6 that may
> be affecting this. Please try a build from nightly.ardour.org
> <http://nightly.ardour.org> (the free/demo is fine if you're not a
> subscriber) and check if the issue still exists ... Thanks.
>
> On Wed, Feb 15, 2017 at 12:02 AM, Mirko Horstmann <bb at mirkokosmos.net
> <mailto:bb at mirkokosmos.net>> wrote:
>
>     The buffer size is 128 samples (2 periods, 48kHz). Pianoteq is
>     running as an LV2 plugin. My MIDI keyboard and synth are connected
>     via USB and I'm using a2jmidid.
>
>     Is this about the "Adjust latency..." settings? All channels are set
>     to 0 samples.
>
>     Mirko
>
>     On 13.02.2017 13:36, Paul Davis wrote:
>
>         Ardour carries out a process we call "alignment" when capturing
>         data,
>         which typically means moving it a little earlier than the time
>         at which
>         is was capture, to compensate for latency in the data pipeline that
>         exists between your hard disk storage and actual audio. It is a very
>         complex system, much more complex than most users would likely
>         guess,
>         and the behaviour varies depending on the I/O connectivity of
>         the track
>         in question. If a track is connected to actual hardware, the
>         alignment
>         process is different than if the track is wired only to software
>         sources.
>
>         So .. (1) what buffer size are you using (2) are you using
>         Pianoteq as a
>         standalone synth or as an LV2 plugin, and if the former, how are you
>         bridging MIDI into Ardour?
>
>
>
>         On Mon, Feb 13, 2017 at 12:41 AM, Mirko Horstmann
>         <bb at mirkokosmos.net <mailto:bb at mirkokosmos.net>
>         <mailto:bb at mirkokosmos.net <mailto:bb at mirkokosmos.net>>> wrote:
>
>             Hi,
>
>             I was about to file a bug report for this, but it seems so
>         obvious,
>             I'm not sure if I'm doing something wrong...
>
>             Whenever I record MIDI, Ardour 5.6 will show the notes in their
>             right position during recording but after I stop the recording,
>             it'll move the notes to the left in time line by a few hundred
>             milliseconds. I checked this several times playing to the
>         metronome
>             and it's also apparent when recording the audio at the same
>         time,
>             the following is with Pianoteq 5 but it's the same when I use a
>             hardware synth, in the screenshots, it's about 400
>         milliseconds but
>             I think I've seen other amounts, too:
>
>             MIDI vs Audio during recording:
>
>         http://www.mirkokosmos.net/images_in_forums/ardour_during_recording.png
>         <http://www.mirkokosmos.net/images_in_forums/ardour_during_recording.png>
>
>         <http://www.mirkokosmos.net/images_in_forums/ardour_during_recording.png
>         <http://www.mirkokosmos.net/images_in_forums/ardour_during_recording.png>>
>
>             MIDI vs. Audio after recording:
>
>         http://www.mirkokosmos.net/images_in_forums/ardour_after_recording.png
>         <http://www.mirkokosmos.net/images_in_forums/ardour_after_recording.png>
>
>         <http://www.mirkokosmos.net/images_in_forums/ardour_after_recording.png
>         <http://www.mirkokosmos.net/images_in_forums/ardour_after_recording.png>>
>
>             I cannot remember this happening in earlyer versions.
>
>             Mirko
>
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