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. 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