continuous knobs glitch

I have a MPK 49 and there is a glitch with the knobs that i hope someone can help with. I will assign the knob, and the when using the knobs they will jump from max to min by looping around. how do I program logic to stop the value once it reaches the max?

imac intel 2.0 ghz, Mac OS X (10.5.2)

Posted on Sep 6, 2008 6:54 PM

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9 replies

Sep 7, 2008 6:26 AM in response to Eriksimon

I have continuous knobs, which means that I can turn the knobs continuously without anything physical stopping them. Instead, they are electronically stopped by their own parameters that extend from 000 to 127. I currently have them assigned to separate fader banks, tracks, and effects. But no matter what I assign them too this glitch always happens.

Let's say that I'm turning the volume of fader bank 1 up all the way, and the logic pro fader bank is half way up. I will twist the knob till it reaches the max parameter, which is 127, but in the software's fader bank it is not at the max limit. Instead, somewhere 3/4ths of the way the logic software slider moves from half way, to max, then it loops from max to min, but the logic slider is still moving up. And it ends up stopping about 1/4th of the logic sliders volume.

This takes place no matter what I assign these knobs to. I have an Akai MPK49 controller, and I am running a Midi controller program called Vyzex MPK49.

Sep 7, 2008 6:58 AM in response to drobot

Hi,

I should have realised you meant the Akai.
First tip/question: have you monitored the midi coming from the MPK? You can do that with a standalone app, but you can also go to the environment window, and select "clicks and ports" from the dropdown menu top left of the window. In the "input view" object you can monitor in realtime what midi messages are being sent.
Second question: What does the program do? I do believe Logic can communicate directly with the Akai, I think that that might have something to do with your problem. How do you assign them? In Logic, or in the Vyzex (proprietary?) program?

regards, Erik.

Sep 7, 2008 2:29 PM in response to Eriksimon

Well, I used logic with out the program and it did the same thing. I assigned them by tickling the volume button on the software, pressing control-L, then moving the knob on the controller. I do agree that the problem may be with with to programing of the Akai, which is done through Vyzex. I do not use vyzex to program the key assignment, but it is useful in formating MPC pads and the appeggiator.

Sep 7, 2008 10:30 PM in response to drobot

Do you have the legacy Emagic USB MIDI Driver installed on your system?

I experienced the same thing and it was being caused by the emagic MIDI driver that gets installed under Hardware Support in the Logic Studio installer. I believe it is also installed by Garageband but I cannot remember if that is the case or not.

I was using it with an emagic MT-4. Pulled the driver and issue was gone. I had to purchase a new MIDI interface so I can use the MPK49 with my system as this driver is old and no longer being developed and I'm not going to wait and see if AKAI finds there is enough impact from this to spend the money to fix it.

The driver is located in Library/Audio/MIDI Drivers/EmagicUSBMIDIDriver

Pull it and test. You should find that it works fine after that.

Cheers

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continuous knobs glitch

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