Re: time shift when recording from one midi track to another

Did you ensure that track B was disconnected from all hardware inputs?

On Thu, Jan 25, 2018 at 5:24 PM, Victor <[email protected]> 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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