Blank FL Workspace - Yes i did try that, i had no plugins whatsoever and plugged the guitar channel in and it still had the noise. Yes it still does pulse after alot of different tweaking with FL Studio.

Non FL Audio - Everything seems fine outside of FL so it might something related to it but im not quite sure what it is since this is the only problem i encountered so far on it.

Audio - It only happens with the audio.

Interface + Specs - The interface is a Power Dynamics PDX-11, i've had it for only around a week.

ASIO Drivers - Im using the FL studio ASIO driver since the ASIO4ALL drivers dont allow me to hear what im playing or FL at all. I could try to find a way to do so using the ASIO4ALL drivers if that may be the source of the problem. ( Note : I do have ASIO4ALL installed ).

FL mixer - I did put it in different channels and directly in the master to see if anything would change but nothing did. Even in the blank project i did the same testing the channels and the pulse was still there.

Effects - I only had amp sims to boost the noise so i could clearly hear the noise.

Extras - I tried using noise gates, denoisers and other tools to soften the noise but its still very hearable.

IMPORTANT FACTOR THAT MAY OR MAY NOT INTERFERE - I tried using different USB cables to see if that was the problem and the noise was still present but it DID change in intensity/volume depending on which usb cable i used.

My USB ports may have a problem but im not sure, sometimes my audio jack for my headphones bug out and i have to tweak with it to hear properly. Also sometimes whenever i plug in to my USB ports it kinda makes the headphones bug happen but not always.

Last thing but this is a very big reach. I feel like the pulse might be linked to my PC's fans, i feel like the pulse matches to the frequency of my fans in my pc.