Capture whatever your mac is playing to a .wav file on your Desktop—as simply as a screenshot.
(This is alpha software. It will cause your computer to catch fire.
NB: WavTap is completely broken on El Capitan due to Apple's [System Integrity Protection] (https://en.wikipedia.org/wiki/System_Integrity_Protection). The next release of WavTap will fix this.
As of Yosemite, Apple bans drivers that haven't received explicit approval from Apple. The only workaround I'm aware of is to set a system flag to globally allow all unsigned kernel extensions. This means WavTap will not work unless you've enabled
kext-dev-mode, using something like this:
sudo nvram boot-args=kext-dev-mode=1
Yes, this sucks.
Once that's done, run the installer.
make uninstall removes everything