If you're using third-party plug-ins, try any of these recommendations to fix your issue depending on what you're experiencing:
Tal Reverb 4 (Free and amazing VST for adding reverb effect; For other cool VST plug-ins, see Appual’s guide “Ultimate Guide to Free DAW Plug-Ins for Guitarists” – there’s some gems in there that can be applied to your music as well, as well as a list of websites that offer tons of free VST downloads. Anyway, back to the guide. Mar 30, 2019 You may have an idea to run VST plugins without DAW software on your PC or Mac. You’re right, you can. For example, you want to run guitar amp simulator along with the cab impulse loader and all kind effects. And run em all at once to build a guitar effect chain.
If you're having an issue in a particular Logic Pro project or MainStage concert that uses third-party plug-ins, bypass each third-party plug-in in the project one-by-one, testing the project after you bypass each plug-in.
You can bypass plug-ins several different ways:
If bypassing a plug-in fixes your issue, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.
If you can’t open Logic Pro or MainStage, try manually removing plug-ins.
If you still can't open Logic Pro or MainStage:
If your Mac is running macOS High Sierra or later and you recently installed a plug-in that isn't available in Logic Pro or MainStage, restart your Mac. Before you restart your Mac, confirm that the plug-in is 64-bit compatible. 32-bit plug-ins aren't compatible with Logic Pro or MainStage.
If a recently-installed plug-in still isn't available after restarting your Mac, confirm that the plug-in is installed:
If the recently-installed plug-in is installed, use the Plug-in Manager to rescan the plug-in.
To automatically rescan all installed plug-ins, remove the Audio Unit cache file.