Step1: Install Soundflowerbed: https://github.com/mattingalls/Soundflower/releases/tag/2.0b2 then reboot after setting it up
Step2: Start soundflowerbed and then get into its setup screen. Set your default input and default output over to the 2-Channel Mixer like this:
Step3: Set your MacOS default audio speaker on the UI toolbar to the same 2 channel mixer device, like this (you will stop hearing sound after doing this):
Now, for this to work properly you will need a headset if you intend to use your microphone on top of whatever sound you want to pipe to the scammer from a program. Configure soundflower to send the monitoring audio over to a headset device (in this case it's to a pair of Bluetooth earbuds):
Step 4: Using the Opera browser, which works best for this... setup the input and output to use the 2-channel mixer device, be sure to hit SAVE:
Step 5: Use a different browser such as Firefox or Chrome to play audio tracks. Use the Opera browser to make the BobRTC calls. You must use two different browsers to do this so that the audio tracks will mix properly.
Here's a recording that demonstrates how good this can work if you do it right:
https://wedonttakeamex.com/audio/OLxYBAFHJ0rgrU1o