Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I am watching a long video on YouTube and the audio is terrible, mostly because there is a lot of high-frequency noise. I'm about to get a headache.

Is there any software that can capture my system audio out (like Airfoil can) and run it through filters, or even a simple multi-band equalizer?

share|improve this question

3 Answers 3

up vote 3 down vote accepted
  • Set Soundflower as the default output device (in order to capture output from applications that don't support custom output devices)
  • In the application that's used for the effects, set the input device to Soundflower and the output device to a normal output

The default output device can be changed from the Sound preference pane or Audio MIDI Setup:


The application that's used for the effects needs to support:

  • Custom input and output devices (Fission doesn't?)
  • Playthru with effects (Audacity doesn't?)

I added instructions for Garage Band and AU Lab, but any DAW or standalone version of an effect plugin would probably do as well.


Garage Band only allows you to make a new project by choosing a template. Anyway choose for example the Voice template:

Change the input and output devices in the preferences:

Focus an audio track, and enable playing back the input:

Add effects in the edit tab:


AU Lab was installed with Xcode before 4.3, but it can now be downloaded from https://developer.apple.com/downloads/.

share|improve this answer
    
+1 for the clear instructions. –  JRobert Aug 11 '11 at 19:30
    
My hero. Thank you for the clear instructions for both GarageBand and AU Lab. –  Alan H. Aug 11 '11 at 20:46
1  
AU Lab is now available through apple.com/itunes/mastered-for-itunes –  ktolis Dec 26 '12 at 22:00

Another viable solution is to use Airfoil, which can capture system audio and play it back locally (with a ~3-sec delay), and has an Effects menu which has a multi-band equalizer. (It’s not free but it’s a useful bit of software I already owned!)

share|improve this answer

Soundflower is free and can capture your audio and send it through another application such as iTunes, which has an equalizer.

share|improve this answer
    
Intriguing. iTunes can “stream” from Soundflower? How? –  Alan H. Aug 11 '11 at 2:14
    
Ah, yes - I don't know that iTunes can. Try audacity.sourceforge.net instead. Or Garage Band, as Lri suggests. –  JRobert Aug 11 '11 at 19:29
    
I couldn't figure out how to do this with Audacity either. You can hear the input from Soundflower by selecting Transport - Software Playthru (on / off) and recording, but I didn't find a way to apply any effects in real time. –  Lri Aug 12 '11 at 17:59

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.