Oops! can only play sound files on computer internal speakers?

Help:
Oops! can only play sound file on computer internal speakers ?
I must have tweaked something ?
Pls , how can I fix this ?
Thanks for your Help…

Start by making sure that your other speakers can be used by the computer. There are several ways to test this the simplest being to use the run command option and type in mmsys.cpl. This will bring up a control panel showing playback output devices in the first tab. If your desired output device is listed and shown as ready select it and go to properties. Choose the advanced tab and then click the test button. You should hear the windows test chimes.

Provided this is OK you can then go to Audacity and use the audio setup button to select the required output device or if necessary use “audio settings…” to choose the correct windows audio protocol. I am assuming that you are on the latest Audacity release but earlier version are similar.

AH… audio setup button + playback device:
That did the trick .
Thank you very much !

Here’s what I am working on
https://vmars.us/ShowMe/Orig-Left-Track-Tweak-Right-Track-Minus-8hz.mp3
Creating an 8hz ‘subliminal difference tone’ (needs earphones) .

Now Headphones & Bose speakers are mixed-up .
When I click on Audio-Setup-Btn then Bose .
It plays thru connected headphones .
And when I click on headphones it now plays thru Bose .