O.K. I've checked the Output Device Setup and that looks normal. Since I don't have my Apogy Duet installed yet the "Audo" "Core Audio" settings are set to "Built In Output" and "Built In Microphone". Everything else is set exactly to the same settings your link shows. Nothing is muted on my "System Preferences" on IMac. I took a look at the "Audio Devices" section in my "Utilities" folder. Source is set to "Headphones". Format is 44100.0 Hz 2ch-24 bit. I tried to adjust the "M" volume underneath the "Ch" heading and that slider doesn't move. Channels 1 & 2 are set at a value of 0.37 dB -22.50. The mute selection square boxes are unchecked. The "Output" icon box was grey at the top. I clicked on the "Configure Speakers" icon, tested left front and right front speakers and they test O.K. Without working down further in the tutorial I decided to open a new project and just throw in some loops and other sounds and I can hear them fine. Appears problem solved, however, where can I look for "The Numbers Game?". I want to re-load that demo and see if it will play normally. As always, I never take the help you've provided for granted so many thanks.