To ensure your Apogee product works well with Mac OS X Leopard v10.5, it is critical that you follow the instructions provided at the link below.

If you have an existing Apogee software CD or a previously downloaded installer, please do not use it with Leopard. Only use the software and driver versions provided at the link below that are specifically indicated as “Compatible with Leopard.”

http://www.apogeedigital.com/leopard/