Radio static is all about the right bandwidth, motion, and transient behavior. If you need a believable "searching for a station," prompt for movement and scan clicks. If you need background noise under dialogue, choose a steady hiss bed with low crackle density and a clean loop. Use the tips below to get static that matches the device (AM car radio, handheld, old recorder) and the moment (brief burst vs sustained interference).
Match the device: AM, FM, handheld, or recorded
The same static feels different depending on where it's coming from. AM tends to be narrower and grittier; FM can sound smoother; handheld comms often have abrupt gates and scratchy bursts. If you're mimicking a recorded source, add tape-like softness or light flutter.
- Prompt "narrowband AM" for boxy midrange and gritty hiss
- Prompt "FM hiss bed" for smoother, less clicky noise
- Prompt "recorded on tape" for softer highs and mild flutter
Choose steady beds vs bursty interference
A steady bed supports long scenes without drawing attention, while bursty interference sells disruption, jamming, or a push-to-talk edge. Decide whether you need loopability (beds) or punchy transients (bursts) before you download or generate.
- Beds: ask for "stable level, loopable, minimal pops"
- Bursts: ask for "crackle spikes, abrupt cutoff, no reverb"
- For scans: ask for "ticks between channels" to add rhythm
Control movement: tuning sweeps, flutter, and fades
Motion makes static feel like a real receiver searching or losing signal. Tuning sweeps add direction; flutter suggests unstable reception; fades help you transition between scenes without an obvious hard edit.
- Prompt "dial sweep" for a quick search-and-stop gesture
- Prompt "fluttering hiss" for unstable signal behavior
- Prompt "swell then fade" to land transitions cleanly
Avoid common mismatches
Static can easily sound too bright, too stereo-wide, or too repetitive when looped. Keep it believable for the space and device, and make sure it doesn't fight the voice range if it sits under dialogue.
- Avoid overly bright fizz if the scene implies a small speaker
- Avoid heavy crackle under dialogue unless it's a plot point
- Avoid obvious repeating patterns when you plan to loop
