Noises only while recording: microphone or sound card problem (...or laptotp)?

Hi everyone,

as you can understand by the title I'm a bit confused about my issue and I really need your help. My gear is a 15" MacBook Pro 2015 i7 2,6 ghz (16 GB ram), a focusrite 2i2 2nd gen and a condenser microphone AKG k 121s.

I'm recording cover songs while I shoot live videos with my camera, but it doesn't have an external rotating display, so I decided to start the video recording by connecting either the camera to my laptop with the EOS utility app.

For summing up: when I record, the camera, the sound card and the midi keyboard are connected to the MacBook Pro. Any time that I don't make a recording session the microphone goes well, but when I start the recording both on the camera and the microphone, the mic gain turns critically down, the voice buzzles and sometimes I hear cpu noises.

I will attach you below the wavelength. Before of singing the record goes well. When I start sing, the first seconds everything is fine but suddenly the microphone pops and the recording comes up with a lot of white noise and popping sounds.

I also attach you the sound recorded.

https://sndup.net/8xnt

Thinking that was a matter of cables, I bought an high quality usb cable. I've also searched for a solution and someone suggested to turn down the buffer size (to 256) and the sample rate (to 44,1 kHz) in the Logic preferences. After this setting, CPU noises are mostly disappeared - but as you can hear they still persist- , and the volume still turns critically down.

I've thought also about microphone voltage problem. In addition, I'veshut down all the wifi and bluetooth concoctions in the room but nothing changed.

I'm wondering if it could be an over-consumption of usb energy, but sometimes, when the camera is disconnected, the problem still persist.

I really don't know Do you have any suggestions? Thank you for your help!

Recording live while everything is connected to the laptop is gonna give you syncing and clocking problems.

To get the best quality video and audio need to be recorded on different mediums at the same time.

Then you put it together in iMove or Final Cut.

Remember for video to record audio at 48k.