When I code I use white noise, or pink noise, but it's run through a low pass filter to trim off the harsh high ends. I'll also add a slight comb filter then m

When I code I use white noise, or pink noise, but it's run through a low pass filter to trim off the harsh high ends. I'll also add a slight comb filter then modulate the frequency with a slow LFO (around .05 hz) to give it some movement. Some extra processing then happens like a compressor to even it out a bit and add warmth. It's quite effective, especially for noisy environments.