[ardour-users] doing weird and unconscionable things with Ardour

Per Sigmond per at sigmond.no
Tue Nov 29 05:33:01 PST 2005

Quoting Dave Phillips <dlphillips at woh.rr.com>:

> Greetings:
>   As I explore the depths of 0.99 I decided to check out its support for
> MTC. In past releases I've had little luck with it but it's also been a
> while since I tested it.
>   So I fired up Ardour, set the option to send MTC, then I opened up
> Sequencer Plus running under DOSemu and set it to receive MTC (30 fps
> non-drop). It took a couple minutes to get the connections straight, but
> finally everything was set up and ready for tests.
>   Amazingly, it worked and worked perfectly. Seq+ locked to the time
> code without troubles and the recording was flawless. Another impressive
> feature, perhaps most valuable to those of us still working with MIDI.
>   The fact that the time code works with a sequencer running under a DOS
> emulator is a testament to the excellent programming skill that has gone
> into Ardour and into Linux generally. I wonder how well this scenario
> would work with, say, Cubase and Seq+, both running under XP. Is it even
> possible ?

Ardour works well both as MTC master (as you did) and as MTC slave provided that
you use a low latency setting in jack. With ardour as MTC masterm, setting
latency to more than 10 msec makes many MTC slaves confused (too much jitter in
the MTC code from ardour). This jitter problem is not present with ardour as
However there is currently a bug that makes ardour "late" by an amount depending
on the latency setting (happens both as slave and master). With latence > 20
msec this becomes quite audible. This will be fixed though.

Bottom line, set jack latency low if you want to use MTC.


>   Alas, I don't think I have any apps outside of Ardour that *send* MTC,
> so I didn't test it in that direction. Seq+ does send MTC but it's
> hardwired for a multiport interface that can't be simulated (at least I
> haven't figured it out yet).
> Best,
> dp
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Per Sigmond
Gjert Sorensensvei 5
4879 Grimstad

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