Basic MacOS script, to toggle audio output interface between two options

Hello, You must have experience in writing MacOS scripts. I have this basic script that I found, and it does 90% of the work. You need to complete the rest. Here's what I'm looking for: I have about 10 output audio interfaces on my Mac, but I only care about 2: one goes into my digital-audio box->headset second is "Line Out", which is connected to my speakers. I have a full-size Mac keyboard, with F keys up to F19. I would like to connect one of the available keys to this toggle script, so that, upon pressing the key, the interface switches from one to two, and from two back to one. If this simplifies the task, I could program this task with Bettertouchtool, and associate the script with one of those key functions, and the script can do the toggling. Here's the script that does almost what I need: [login to view URL] Good luck Edit: (found another reference to changing audio interface, could be useful too): [login to view URL]