Jack-MIDI and Alsa MIDI Ports Connections

[musicology]

Hello,

I am using the Edirol FA-66 Firewire Audio Interface, which does also have one MIDI-Port. Now there is a problem with the Jack-MIDI and Alsa-MIDI ports in the Jack connections window, they are seperated. The Firewire-MIDI port shows up in the Jack-MIDI window. If you start an Audio/MIDI Sequencer like Rosegarden, it does only show the Alsa-MIDI ports, so you are not able to record and play a MIDI-device, which is connected to the Firewire-Interface.

Thus I searched the web and found the program a2jmidid, which builds a "bridge" between the Jack-MIDI and Alsa-MIDI ports. It can be started in the terminal with the following command for example: a2jmidid -e
output:
Bridge starting...
Using JACK server 'default'
Hardware ports will be exported.
port created: Midi Through [14] (capture): Midi Through Port-0
port created: Midi Through [14] (playback): Midi Through Port-0
port created: M50 [16] (capture): M50 MIDI 1
port created: M50 [16] (playback): M50 MIDI 1
port created: ESI KeyControl 25XL [20] (capture): ESI KeyControl 25XL MIDI 1
port created: ESI KeyControl 25XL [20] (playback): ESI KeyControl 25XL MIDI 1
Bridge started


Then there is another program, which is called Patchage, the screenprint of this window is attached. I connected with Patchage the MIDI ports of the sequencer, and then it was possible to play and record the MIDI device, which was connected to the Firewire-Interface.

So basically everything is working. However there is still a problem with the stability of such a system, Jack tends to stop whenever there is an "unusual" event.

Best Regards
Ralf

[musicology]

Hi,

My Laptop (Macbook) has an Intel Core Duo, and the CPU frequency is switching from 1GHz to 1.83GHz depending on the requirements. When I set the frequency to max, which means 1.83GHz, then it does look like that the stability of the system with running all the applications is much better.

Best Regards
Ralf

[zettberlin]

Hi,

My Laptop (Macbook) has an Intel Core Duo, and the CPU frequency is switching from 1GHz to 1.83GHz

Freq-switching was often reported to be a problem for jack. I had good experiences setting the frequency lower then max by default though. So running the system at full throttle all the time is not absolutely needed.