From what I remembre anny other upgrade I did before this last one to El Capitan my hardware was working. And now it is not working and everyone except me think this is normal ... i dont want to go back to Yosemite so I have no choice but to wait ... Can I have a rough estimate of how long it may take before I can use my DJM again (usb sound card) and when a driver will be available or if a temporary work around is possible If I dont want to reinstall the previous OS ... I am willing to wait 2 more weeks but I think it ahould not be my probleme ... Don't worry next tome I will back up on time capsule and wait fir Pioneer authorization to update my system