[Ardour-Users] time shift when recording from one midi track to another

[Victor]

Yes, the only input of track B is track A.
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Le 25 Jan 2018, Paul Davis <paul at linuxaudiosystems.com> a ?crit :

> Did you ensure that track B was disconnected from all hardware 
> inputs?
>
> On Thu, Jan 25, 2018 at 5:24 PM, Victor <victor at svictor.net> 
> wrote:
>
>> Hi,
>>
>> I?m trying to understand the following behavior in Ardour 
>> 5.12.0
>>
>> 1. Create 2 midi tracks, A and B
>> 2. On track A, create a midi region and put 1 note every two 
>> beats in it
>> (notes aligned to the grid).
>> 3. On track B record the midi output of track A.
>> I would have expected the resulting region on B to be an exact 
>> copy of
>> the region on A. Instead, all notes on B are shifted
>> slightly before the notes on A. The very first note of A is 
>> actually not
>> rendered at all on B (maybe because it?d start too early before 
>> the B
>> region).
>> I attach a screenshot.
>>
>>
>>
>>
>> Is this a side-effect of read-ahead latency compensation[1]?
>> If so, can I set/disable the read-ahead time somewhere in 
>> Ardour?
>>
>> Looking at latency, I also wonder how to interpret the 
>> information in
>> Window --> Audio/Midi Setup. It says that my buffer size is 128 
>> samples
>> and there is an additional 2.7ms between brackets after 
>> that. Is this
>> a latency estimate? Qjackctl says that my latency is 8ms.
>>
>> I start jack from qjacktl with the following settings:
>> Samplerate: 48000
>> Frames/Period: 128
>> Periods/Buffer: 3
>>
>> Regards,
>> Victor
>>
>> [1]http://manual.ardour.org/synchronization/latency-and-late
>> ncy-compensation/
>>
>>
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