worst case

if the .wav file is not in the dir where your .mgu file is copy it there & rename as your .mgu and yeah it's not optimum but it will tell you if the file loads with the song

if you haven't tried it yet a reboot & opt > return all to factory settings may help


M4 pro Mac mini 1tb HD 24GB mem M3 MacBook Air 16GB mem casio wk7500 presonus audiobox i2 usb interface