Brown noise with a slow underlying swell running beneath it instead of sitting flat, paired with tighter reverb than most of Focus and bells pulled back to 0.5 gain. The name is literal: there's an actual current of movement under the noise floor, not just static.
This is the one for actually sitting down and grinding through something, not half-working with pleasant sound in the background. Less decorative than Café Hum or Crystalline, more of a tool for concentration than a mood. If Deep Work's tighter, more contained version works for you already, this is a close cousin with a bit more motion underneath.
The swell is generated in real time along with everything else, so it never settles into a fixed, predictable cycle.
StillTune composes endless, ever-changing music for sleep, focus and relaxation. Real melody and instruments, generated live, with no audio files. Explore more sounds.