: A significant bug affects Audio Units version 3 MIDI FX processors. When an AUv3 MIDI FX is inserted on an instrument, the instrument will only produce audio reliably when that track is currently selected. If another track is selected, the instrument may not play at all. Additionally, AUv3 MIDI FX plugins may appear duplicated eight times in the plugin menu. This bug was addressed in later versions.
Go to Logic Pro > Preferences > Plug-in Manager to ensure all your third-party VSTs/AUs are correctly validated. download logic pro 10.5.1
The modern replacements for the aging EXS24, featuring auto-mapping and instant sample slicing. : A significant bug affects Audio Units version