If you are converting AVCHD files and there is no sound on the resulting CineForm files, you should install the AC3Filter from www.AC3Filter.net.
Here's a direct download link:
During installation, be sure to select both the 32-bit and 64-bit components.
Once that is installed, reconvert your AVCHD files and you should have audio in the converted files.
Note: If your source files are from a Canon DSLR, also make sure you have the latest QuickTime Player installed.