I have the following aggregate device to record audio on the computer however I am sometimes getting some very bad feedback buzzing noise can be heard in this podcast episode.

https://cafe.simplecast.com/episodes/fazale-rana at 41:30

What are the correct settings and clock source but I need get the audio?

I currently am using this:

enter image description here

I also tried this but I still get the buzzing noise

enter image description here

perhaps my issues lie with the output?

enter image description here

  • I don't know the iShowU system at all, but it looks to me like you've got an output sending directly to it, which may well simply return from its input. That will generate feedback. Maybe see support.shinywhitebox.com/hc/en-us/articles/…
    – Tetsujin
    Dec 20, 2019 at 7:43

1 Answer 1


I believe the problem you are experiencing is caused by the computer CPU receiving to many command redirects. This delays the audio from being cached (stored) in the buffer at the proper time to be outputted. The lack of momentary audio data (samples) results in the static or clicking sounds. Proof test 1: Does this problem occur when the laptop is cold and just turned on? If no, then this is the problem. Is short you are asking the computer to do too much and as time passes the accumulative effect plus with the computer running warmer/hotter it will start to experience audio problems. You will note that the problems first starts with your onboard microphone. Yet, the guest input remains normal with no problems. Resolution 1: Poor-Maybe the computer is throttling back on the CPU because of excess heat. Do what you can to reduce the computers operating temperature. Resolution 2: Increase the cache buffer size in iShowU. I am unfamiliar with this and a quick review did not lead to this being a possible alternative or not. This will create a delay in the signal. Find a happy medium if this option is available in your iShowU audio preferences. Resolution 3: Flushing the RAM sometimes works. I use the free version of this "Memory Clean 2 (Direct Version)" and flush the RAM when static starts. Resolution 4: Try using a different (light weight) browser. Resolution 5: Amazon search this: Focusrite Scarlett Solo (3rd Gen) USB Audio Interface with Pro Tools | First. Then you need a XLR (balanced) microphone (no USB). This will be a $200 setup. You can use Pro Tools |First if you want as an alternate recording device.

I experienced the same problems over a decade back. It doesn't matter how powerful your CPU is or how much RAM you have. This problem is not cause by the lack of either, it is a data flow problem. An external audio interface plus a XLR (balanced) microphone is a solid start to removing audio problems.

I noticed your voice needs a compressor on it to enhance the clarity of your speech. If you use the Pro Tools | First (free) included I believe it comes with a compressor as well as other virtual audio hardware (EQ & etc)you will adopt for your productions.

  • thanks I'm using Garage band and I will make sure compression is turned on. I seemed to have resolved the issue by re adding all the inputs and making sure drift correction is only on the non main clock source inputs
    – Nikos
    Dec 23, 2019 at 13:28

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .