I will assume that you set the radio up taking the defaults. When the system comes back up Verify any changes you have made are still there.It is the last selection and will bring up another menu usually in the middle of the screen. Go to the Raspberry icon at the top left of the screen and after pressing on it select " Shutdown".To do this, on the main mumble screen now showing press Server>Quit Mumble. THIS Step IS IMPORTANT To save your Mumble changes you must Quit Mumble and Reboot.
This ensures no TX audio dropout's at some installations.
If you don't know how to do this please read your manual. Put this SD card back into the radio and load them. dat file you downloaded in step 1 and copy it to the settings sub directory on the SD card. You Must do this in order to create the file structure on the SD card. Backup your IC-7300 to an SD card that you will put in the front of the radio. As of it is located in this directory: 2. In the files section of this forum download the latest. I no longer Beta test but am still glad to help Icom user as time permits. Let me know if you have questions about this as it may change with the future releases. If your receive audio sounds bad as a water type sound you need to go into Mumble and change it from default to the proper device you are using in both the input and output. If you are using the USB connection you don't need to change anything.
NOTE: If you install the new audio file per Howard's instructions you will need to use the new overlay as the default system selection if you are using the audio card. I accidentally deleting them when deleting some other messages. This is a repost of the IC-7300 set up instruction.