[Ardour-Users] Another newbie Question: Anyone having experiences with following setup: Ardour, Jack, Linux, Lexicon Omega (or other USB1-device) ?

[Ralf Mardorf]

On Tue, 14 Feb 2017 00:29:35 +0100, David Kastrup wrote:
>"Chris Caudle" <chris at chriscaudle.org> writes:
>
>> On Mon, February 13, 2017 2:53 pm, Harry Rüter wrote:  
>>> Latency housekeeping/Ardour can you tell more about that ?  
>>
>> You can use tools provided with jack or Ardour to measure the total
>> delay from output of jack software, through jackd, out through
>> hardware, back into the hardware input, back through jackd, and to
>> the jack software. There is an assumption that output path and input
>> path of the hardware have symmetical delays,  
>
>This "symmetric delay" assumption is more of an aesthetic thing than of
>any relevancy.  The important value for multitrack recording is the
>overall systematic delay of playback+record.  This is the value to be
>used in compensation, determining the delay of new samples in respect
>to old samples being replayed.  Just where the physical action is
>happening between replay and record is irrelevant to Ardour _unless_
>there is yet another timed path to the artist, like a _flashing_
>metronome (or you try singing/playing to the time code display).  An
>_acoustic_ click track does not count: it again fits the overall
>systematic delay pattern.

Even if a visual metronome should be displayed with an optimal
compensation, the audio signal has got priority, so anything we see on
the screen while playing and/or recording audio, could be completely
out of sync. A GUI could not be used as director.