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

Mirko Horstmann bb at mirkokosmos.net
Tue Feb 14 15:02:03 PST 2017

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.


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>> 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>
>     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>
>     I cannot remember this happening in earlyer versions.
>     Mirko
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