Short electronic UI confirmation sound, 0.8 to 1.2 seconds, loud and upfront in the mix like a modern voice app push-to-talk “mic on” cue (similar energy to Discord’s PTT activate sound): crisp transient, noticeable mid-forward tone, clear presence, not subtle, not whisper-quiet, but still clean. Modern communications app, no voice, no speech, minimal reverb, mono-friendly, slight punchy body, avoid ear-piercing highs and avoid long noisy tails.