ORBIT | Task Confirmation Sound

Delivered as a real MP3: ORBIT-task-confirm.mp3, 44.1 kHz / stereo / 320 kbps CBR, 3.53 s long.

Sound design (three parts, as requested)

1. A soft low pulse to open: a warm sine pulse gliding from about 135 to 110 Hz with a 45 ms attack and no sharp transient.
2. Two clear, slightly glassy synth tones rising from 660 Hz to 990 Hz, with quiet, quickly decaying inharmonic partials (2.76×, 5.40×) for a crystal texture rather than a melody.
3. A short, clean airy tail: a band-limited air layer at 3.2–11 kHz with a soft attack and a natural decay.

Checked on the final MP3

• Length 3.53 s (3–5 s requested) ✅
• Clean start: a click-free 4 ms fade-in from silence, nothing cut off ✅
• Full tail: the sound decays naturally by 2.76 s, followed by about 736 ms of silence ✅
• No overload: peak −1.94 dBFS, 0 clipped samples ✅
• Listening check: no alarm feel, no melody, no voice, no distortion; the rising interval reads clearly as "confirmed / done" ✅

Every element was synthesized for this piece from original parameters: no samples and no existing film or game sound effects, so it is suitable as a public example.

Want a change, such as a shorter tail, a different interval for the two tones, or a mono version? Tell me the direction.