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

Paul Davis paul at linuxaudiosystems.com
Wed Feb 15 00:39:57 PST 2017

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 (the free/demo
is fine if you're not a subscriber) and check if the issue still exists ...

On Wed, Feb 15, 2017 at 12:02 AM, Mirko Horstmann <bb at mirkokosmos.net>

> 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>> 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_rec
>> ording.png
>>     <http://www.mirkokosmos.net/images_in_forums/ardour_after_re
>> cording.png>
>>     I cannot remember this happening in earlyer versions.
>>     Mirko
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