Making Alert Sounds: From Raw Material to a 2-Second Asset
A good alert sound is under two seconds. Where the material comes from, how you cut it clean, and what format you ship — three small decisions that separate crisp from muddy.
Three sources, in priority order
Ready-made sound libraries: instantly usable but generic. Extraction from video or music: pull that one "ding" from a favorite scene — extract the audio track losslessly first, then cut. Self-recording: tap a cup, click a pen, record on a phone — the most distinctive texture of all.
Extraction path: use lossless stream copy to pull the track from video (no re-encode), then trim. Self-recorded material needs only one denoise pass if you recorded in a quiet room.
Trim and shape: clean inside one second
Alert sounds demand tighter cutting precision than song clips: the start lands 20-50 milliseconds before the attack (a sliver of silence for the transient), the end waits for full decay (reverb tails included). Play it three times in a row immediately — alerts fire repeatedly in real use, and a click at the loop point becomes the user favorite complaint.
Shaping is two moves: micro-fades of 0.05-0.1 seconds at both ends (kills digital truncation clicks — far shorter than music fades, or the sound goes soft); and loudness set to target — alerts must cut through noise without hurting, commonly 3-6 dB above background music.
Format and duration rules
Format by destination: MP3 for web and most apps (small, universally decoded); WAV or native formats where latency matters (game sounds); platform-mandated formats for chat channels. Export quality need not max out — simple content sounds identical between standard and high MP3, at half the size.
Duration rules: system notifications 0.5-1.5s; message pings 0.3-0.8s; video transition stings 0.5-1s; app completion ticks 0.2-0.5s. Anything over 2 seconds is already background music — ask what the sound needs to communicate and the length settles itself.