[Ardour-Users] Ardour as a midi timecode slave

Paul Davis paul at linuxaudiosystems.com
Thu Apr 29 14:17:46 PDT 2021

On Thu, Apr 29, 2021 at 3:15 PM robertlazarski <robertlazarski at gmail.com>

> 1) I need to automate the jack "rolling feature" via command line
> execution, i.e. the play button in the qjackctl UI. That will start/stop
> the transport in Rosegarden via jack_midi_clock start / stop commands. I
> couldn't figure out how to automate the play button. Even without qjackctl
> I am not sure how to start/stop jackd rolling from the command line. Any
> pointers?


> 2) I am trying to do everything on the command line without qjackctl. I
> started jackd with my user account as "/usr/bin/jackd -dalsa -dhw:USBPre2
> -r48000 -p1024 -n2 -Xseq " . Then I executed jack_mclk_dump, then
> "/usr/local/bin/jack_midi_clock --bpm 42 jack_mclk_dump:mclk_in" . Then
> 'a2jmidid -e' , then Rosegarden.
> Where I am stuck is on the right syntax for a2j_control to map
> jack_midi_clock:mclk_out to "rosegarden [131] (playback): record in". I
> think I need the mj2a flag? Please see my qjackctl session.xml file. I am
> about to buy a m-audio Uno midi interface and I am trying to figure out how
> to use a2j_control to connect jack_midi_clock to it as an ALSA device since
> I expect the Uno to connect to Linux over ALSA.

a2j_control is a decoy. It does nothing but start a2jmidid (and without any
arguments which is a problem if you need/want -e)

"to map PORT-A to PORT-B" is odd language. I assume you mean connect?

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