If all of this fails, you can try deleting the VST/AU files from the folders, and re-try the process-except this time, drag the VST files you originally downloaded straight onto your desktop. If you’re using Logic, go to your Audio Preferences and make sure that the 'Core Audio' box is enabled.Ħ. If the plug-in fails validation again, it is likely that the VST manufacturer hasn't provided updates for the plugin, or there may be compatibility issues if you’ve updated to MainStage 3.5 or OS Big Sur.ĥ. In the plug-in Manager, locate Synth1/OB-Xd (or whatever external instrument you’re trying to load) and if 'failed validation' appears in the compatibility column for the plug-in, select the plug-in in the list, then click Reset & Rescan Selection. Go up to your menu bar and open up the Plug-in Manager. Create a new channel strip in MainStage or Logic Pro X and then copy and drag the settings from the malfunctioning strip into the new one by holding down option/alt when you click.Ĥ. Double check that you’ve installed the files in the right directory on your computer - HD / Library / Audio / Plug-Ins / Components.ģ. Restart MainStage/Logic Pro X, or restart your computer.Ģ. There are a few different things you can try to help solve this problem:ġ. But sometimes, MainStage and Logic doesn’t recognize the plug-ins after you’ve installed them-or, in some cases, the VST input is greyed out. Worship Start has awesome sound bundles for external VSTs like Synth1 and OB-Xd.

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