moedawg140
Grand Master Moe "G"….Don't crossface me, bro!
Ping Pong Champ: SF Meet (2016,2017), CanJams (London 2016, RMAF 2016, NYC 2017, SoCal 2017, RMAF 2017)
I just tried it on my Macbook Yosemite (haven't upgraded to El Capital yet) and it works fine, but you do need to go into System Preferences > Sound > Output and select CEntrance as an output device. You may need to do the same in Windows in the sounds settings and make sure its outputting the sound to the CEntrance. Also I know this goes without saying but make sure that the volume is turned on the CEntrance itself.
Hopefully your suggestions will work for him! If not, he may need to try another CEntrance driver. Good looking out on the volume suggestion as well. Definitely the system/computer/device volume, application/music playback application volume and the DACport Slim volumes theirselves should all be checked.