[LAU] External arpeggiator and MIDI sync ?

Len Ovens len at ovenwerks.net
Mon Aug 24 19:14:01 UTC 2015

On Mon, 24 Aug 2015, jonetsu at teksavvy.com wrote:

> On Sat, 15 Aug 2015 08:22:43 -0700 (PDT)
> Len Ovens <len at ovenwerks.net> wrote:
>> On Sat, 15 Aug 2015, jonetsu at teksavvy.com wrote:
>>> Ardour.  The user guide says:
>>>  "the arpeggiator will synchronize to the MIDI Clock and Start
>>>   messages received from a connected MIDI device."
>>> The audio card is a 1010LT.  The Microstation is connected through
>>> USB and is fully seen in jack (qjackctl).  Is it possible to have
>>> MIDI sync for the external synth ? How would the wiring be done ?
>>> Will there be a need for an Ardour MIDI track for the Start (and
>>> possibly Stop) signals ?
>> Ardour already has a "MIDI clock out" You should be able to "mix"
>> this with the midi stream going to the korg if you are using jack
>> midi. Connect your normal midi out to the 1010 port going to the korg
>> and then connect MIDI clock out to the same 1010 port.
>> If you are not using a midi channel to do the actual note press input
>> then it is only one connection.
>> Note: I don't have the devices in question so I am just theorizing.
> Hmmmm.. The 1010LT has MIDI in and out jacks.  Currently not used since
> the Korg is connected using USB.  In Qjackctl's MIDI pane I see Ardour's
> various MIDI connections, MMC, MTC, although in Qjackctl's MIDI pane,
> Ardour is by itself.  There's nothing else to connect to.

My mistake, I saw the 1010 and just figured that was what you are using 
for MIDI. However, the same applies to a USB midi. Your korg should also 
show up in the MIDI panel. If you are seeing only Ardour in your MIDI 
panel of the qjackctl connections window, You probably need to run 
a2jmidid. The command to use is:
a2j_control ehw start
This should be run after jack is already running. It can be added to 
qjackctl's Setup->Options page in the "Execute script after Startup:".

It will stop all on it's own when jack goes away.

> What is this 'jack midi' you have mentioned ?

a2jmidid will connect ALSA to MIDI. The MIDI tab in qjackctl is jack MIDI 
and the ALSA tab is alsa midi.

Len Ovens

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