Noise at 3.5 rung through peaks at 110, 220 and 330 Hz in a nine-second swell
Preview plays right here. The generator adds a sleep timer, full controls, and WAV export.
Resonant Drone is a low, tonal hum that swells and recedes, like a cello section holding a single note through a wall or a large engine that has settled on a pitch. The resonant filters pull a definite note out of the noise, an A two octaves below concert pitch and its first two harmonics.
The color is 3.5, halfway between pink and brown. Three resonant bandpass filters at 110, 220 and 330 Hz with a high Q of 25 and a 60 percent mix ring the noise into a pitched drone. The envelope rises over 2 seconds, settles to 70 percent, holds for 4 and releases over 3, a cycle of nine and a half seconds.
It is used for meditation, as a drone under improvised music, and by people who like a musical undertone to their background sound. Singing Pipes is a brighter, higher-pitched relative at 180 Hz, and Tibetan Bowl uses tighter filters and a bell-like struck envelope. The pitch is fixed, so it may clash with music in other keys.