I'm not entirely sure what sound you mean. At first I though I didn't hear much except a tiny bit of room and circuit ambiance and guitar and human noise.
But then I thought about what you were saying and thought, maybe I'm looking for too small a detail...
By 'buzzing' do you mean the somewhat rhythmic beating in the guitar, particularly in the bass strings? I'd assumed that was a characteristic of your guitar, but I tried imagining it a different way and wondered if it might be a resonance characteristic of the mic you were using.
For reference, most people's problems with standing waves tend to manifest at the bottom end as a boomy resonance in the room -- say when you hit certain notes, the room seems to boom somewhat.
You can use calculators like this standing wave calculator
, to calculate the resonances, but it can be a bit daunting to really make sense of it all.