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EMU Crashing when running MIDI Logic Pro

Hi, I’m having an issue. EMU works fine stand alone and I’m able to basically “play” programs via a midi keyboard. The problem is when I try to run automated midi note triggering through Logic Pro X, EMU locks up and crashes. Yes I have the latest version of EMU Also I saw in another thread there’s an AUv2 for the plug in? I only got a VST3 with my download. Please help I really need this to work or might as well throw out the lights I got specifically to work with this set up.

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Hi Andrei, 


This update is an improvement and is running much more stable. Having some different issues now, however. I'm trying to turn lights on and off to the beat of the song. As I understand your previous comment, I shouldn't be doing this by switching  programs. The plugin version will not load in Logic in the current version so I'm not able to use that. Is there an update to the plugin, or some way to make this load that would resolve this issue? 


For reference, I'm using an M1 Pro macbook pro on 12.4, I'm running Logic in rosetta mode. 

Blake, you may use switching programs to turn on/off the lights. I just said that in log we saw there were over 600k requests. And that is too much. 


Folks, while the issue is not resolved yet and we haven't figured out the reason of it we still doing our best with alpha versions. Here is a new one (23.02.10.4), please try it and share the log file if there are any issues.



Hi Andrei, 


In the current version that I have downloaded (the previous beta you posted), I can turn on/off lights, but no quicker than about 2 seconds. 


Also, perhaps I'm responding too quickly, but I'm trying to download the new beta you just posted and Onedrive is stating that the item does not exist. I'll check back in a little bit to see if it just needs time to upload. 

Blake, your prompt answers inspire us to resolve this issue as fast as possible. The new alpha should be already available thru the link. Try it again please. 

Thank you! I'm still getting the same issue with this link. See attached picture for reference. 

The second link there worked. I will test and report back ASAP. Thank you! 

Hi Andrei, 


I'm not seeing much of a change with this update. I took a video detailing what is happening, what I'm trying to do, and what I'm seeing with the AU plugin. I've also included the log. The video is still processing at the time of posting this comment. I will check back on it in an hour or two and post another comment confirming that it should now be viewable.


 https://drive.google.com/file/d/19MWr0M7ufYJstRupB6HUPP6iR4XHE4as/view?usp=share_link

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Hi Andrei, 


Wanted to provide a new update. Yesterday I tried uninstalling the test versions you've provided, and reinstalled the current official version. I cannot explain why, but all of the issues I was initially having are now resolved. I'm doing the exact same things that were crashing the program when I first installed it, and it is now having no effect. I'm also not having the issues with not being able to turn on/off lights that I was having with the test versions that were provided. I've now programmed 2 songs and have not had any issues. Now the only thing is the plugin still isn't useable, but I'm not really needing that at the moment. I will write here again should any issues arise. 


Thank you again for your hard work and attentiveness on this. 

Blake, I'm in the same boat as Robbie. Can you share how you setup your scenes and programs in EMU? Also, are you using the IAC midi driver output on any specific bus? On my side the app isn't crashing anymore but it is exhibiting the same behavior that Robbie is seeing. It doesn't trigger from some midis and then does for others. Sometimes it takes minutes for the program to acknowledge that it's been sent a midi signal. I'm thinking that maybe we've both missed something that you figured out. If it's something that I'm doing wrong I am more than happy to follow your path if it gets us to being able to use Logic with EMU.

Hello Blake,


First of all thanks for sharing your instance, that might help other users too. I hope Christopher and Robbie will find resolution soon. From my side I will work this with everyone till to the end.


Guys, we've prepared new 23.2.13.4 alpha version of EMU. Please delete the previous one, delete VST and AU plugins and then install it (I think that was the way Blake described). Basically Blake is right, that even current production or beta versions should work. All the alpha versions just have protections in not overloading EMU (which was noticed based on previous your logs).


Blake, could you please do me a favor and shoot a small video from the beginning, how do you make a midi track in Logic and then send notes to EMU? You may do all quick without detailed explanations as we can make pause at any time to follow your actions.

Everyone - after some additional testing, I believe I have figured out what exactly fixed the issue! I tried to replicate what I was doing in a fresh session. At first, I had the same issue with crashing EMU. Here's what you have to do in the official release of EMU to solve the problem. On your external midi channels you have to select OFF for the Midi port in setting. Having this set to ALL, which is the default, will crash EMU pretty much every single time you send midi out. Setting it to off resolves the issue and EMU will act as expected. Based on the info that Andrei has provided, I'm assuming this set to all is creating some kind of midi feedback loop that is overwhelming EMU with 600k requests per second as Andrei said he saw in the logs. 


Andrei - I have uploaded a shorter video just showing what fixes the issue, see below. I am going to opt to stay on the current official release of EMU for now as it is working and stable. As much as I appreciate the work that went into creating all of these alpha versions, and I don't think we would have figured this out without them, I believe the fix is just the one I have outlined above, and no actual change in EMU is needed to resolve the issue. I might suggest having this step included in some instructions somewhere for Logic users as I'm sure many others have had a similar issue since the default external midi setting in Logic is what is causing the crashes. https://www.dropbox.com/s/hp3256f4fk7hzv5/ISSUE%20RESOLVED.MOV?dl=0

Blake, my inspector doesn’t even show me MIDI in and out to do the fix, what am I missing here? See photo

Thanks Christopher :D


Robbie - This was added in Logic 10.7 which came out in late 2021. Check to see what version you're running as it won't be there for any version prior to 10.7. 

Andrei - That's also probably some good information for others, that this feature that fixes the issue is a relatively new addition to Logic. Versions from before late 2021 cannot utilize this fix. 

Guys thank you all for the help, you made great effort to figure out the issue. Especially Blake. As for me I fall back from you and like Robbie don't see Midi out port to make it IAC driver bus 1. However my Logic is 10.7.5. Will try tomorrow to make video, may be you will be able to help me to pair Logic midi with EMU. As I am lusting to reproduce the issue you faced.

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