MacOS – How to route YouTube audio to AU Lab using SoundFlower

If you follow this guide, you should be OK. You mentioned in the comments that you've already run the uninstall script, so perhaps you will be able to follow the guide to success. Before doing that, I would check the following:

1. Find the 'Audio MIDI Setup' utility (Applications / Audio MIDI Setup), and check all the master volume levels on your output devices.
2. If you are still passing audio through anything other than regular system audio, check all the levels and knobs and such to make sure that nothing else is turned down to 0.

NB: A common problem people have with Soundflower is the master volume being set to 0 by default.

If none of that is the issue, and you follow the guide, you could try my setup, which is like this:

• Go find AU Lab 2.3, and • Update your Soundflower to 1.6.7 with this fix, available on Github. It has worked for me on Mavericks 10.9.4, it prevents an obnoxious clicking sound as well, and it gives you master faders for Soundflower outputs in the Soundflowerbed dropdown.

NB: If you are not on Mavericks you may not need the updated versions of everything.

I had same problem just fixed it, so assuming you are trying to record audio from Sound Card. The echo reverb is cause by the microphone in your comp, go SoundFlowerBed-->Audio Setup--> Then right click SoundflowerChannel(The one you've setup)---> Set as "Use device for sound input". And that way the microphone its trying to listen to doesnt exist in that channel.