First, if you are NOT using the Output Groups feature, you can ignore this page content.
Go to Tools > Outputs/Devices > View Output Groups and Devices to see a full listing of the current devices setup. If you see a 'Duplicate Device System Names' error (Listing 1, rare but possible), you will need to Rename one of the devices that has a duplicate. The error will appear at the bottom of the listing. The detected duplicate names will be listed in the Soundmill Help > Session Log.
Listing 1. Output Device definition____________ Device 1 Logical Name: Lobby Speakers System Name: Speakers (Generic USB Audio Dev Id: 886462652073781555 Volume: 100% Is Initialized: True *** ERROR: Duplicate Device System Names detected. See Session log for details.
The Windows API used to discover Device System Names truncates names at 32 characters. So there is potential that two devices could end up with the same System Name after truncation.
Windows applies a prefix to Device names (usually "Speakers" or a national language equivalent). You can change the name prefix in the Windows Settings to give it a unique name. For example, you could change "Speakers" to "Speakers2" or "Speakers3", etc, but it can be any text you want to use.
Recommend that you save a copy of your current Output Groups for reference since you will need to rebuild one or more Groups after these changes. Click Tools > Outputs/Devices > View Output Groups and Devices, then print or save the contents to a file.