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Logic - No sound on recording midi guitar

I use latest logic pro x.
Set up audio channel and linked to midi guitar 2 as fx. Added 2nd track software instrument. As per web instructions. This all works fine and I get the sounds I have selected.

Then when I try and record this - the sound disappears and all I hear is the guitar. I have no other changes made

Help please greatly appreciated. Why can I hear the sound when I play over a track, or when there is no track playing. I keep input monitoring on in all cases BUT when try record the track I cannot hear the instrument chosen???

The “software instrument” track in Logic is a normal track in Logic and behaves like a normal track that plays software instruments via midi. There is nothing special about it, other than it receives midi from a virtual midi connection, rather than a midi keyboard.

Maybe you are trying to set up software instruments inside MG and record them?

There seem to be problems with Midi Guitar 2 and Logic. I can’t get it to make any sound in Logic even though I’ve followed the instructions very carefully. I’ve tried it on two different computers with two different versions of Logic, it doesn’t work on either of them.

Thank you for reporting! Obviously this is very critical for us to understand, if there is an issue.

I have no problems here on Big Sur and Catalina, and I would expect more reports if there is indeed a common problem. But perhaps you guys have something in common that makes it not sound.

If I understand correctly, you can add the MG AU as the video shows, but please help me understand:

  1. Go to Logic Preferences and Plugin Manager and verify that you have MG AU v2.2.1 installed and validated. Sometimes its necessary to Rescan and Restart the Mac after installing new plugins.

  2. When the MG AudioUnit just sits there on an audio track in Logic, it will behave like any other AudioFX - it will output sound. Please verify that this works: pick the test piano inside MG and you should hear piano. This is not about MIDI yet, just an audio track that throughput audio.

  3. Now, please go to Logic’s Preferences and let me know if there is a “MIDI Guitar #1 out” virtual MIDI channel. I suppose this is where it breaks for some reason.

  1. Please let me know which version of MacOS you use and which version of Logic.


  1. One explanation could be that you guys forgot to license MG and it stops and wait for you to click the interruption inside MIDI Guitar?


  1. After spending some time today with Logic, I realised that the most likely cause for MG producing no sound or MIDI is that Logic’s buffersize is too high for real time latency (higher than around 6 ms or 256 samples @ 44.1Khz). In MGs “Interface” tab it will show the buffersize and display a yellow warning triangle in case its too high. Logic is a bit unusual in that it will use lower buffer sizes only when actually recording.

To set buffersize in Logic, go to Logic => Preferences => Advanced and make sure Advanced settings are enabled. Then in Logic => Preferences => Audio => Devices, set your buffersize AND Process Buffer Ranges to Small. Also, in in General tab, set Low Latency Mode and turn off Latency compensation.