To start off, I know nothing about programming.

But right now this programme seems to be the only real alternative to soundcast, so I decided to give it a try by downloading the standalone macOS app and soundflower.

It does connect to the chromcast, it gives that lovely connected sound (with some delay).
It also sends through the sounds of my microphone (again with some delay), but no sound from any programme on my computer.
I have tried changing the sound output and input to both soundflower 2ch, and 64ch.

I am working with a macbook air, version 10.12, and a chromecast audio connected to a regular stereo amplifier.

What am I doing wrong?