Midi guitar not working. Recognized but doesn't work with Garageband instruments

Hi, I have just purchased the Midi guitar 2, and I have set it up as a plug-in in Garageband. In the Midi guitar app, it works. When I make a project in Garageband and add it as a plug-in for a track, It doesn’t work. The test piano keeps playing and Garageband recognizes the notes, but there is no sound from the Garageband instruments. How do I fix this?