Reply To: UltraChannel AU Plugin not working in GaragebandBy robertmccormick / Home › Forums › Products › Plug-Ins › UltraChannel AU Plugin not working in Garageband › Reply To: UltraChannel AU Plugin not working in Garageband March 28, 2019 at 6:54 am #151577 robertmccormickMember Sometimes it happens. Restat GarageBand. Read more about GarageBand.