Updated 2026-10-11
A stream alert and a soundboard clip look alike in a folder, but they do different jobs. An alert fires on top of a busy scene, sometimes several times a minute during a raid, and has to land in a second or two. A soundboard drop or intro stinger is triggered on purpose, so it can run longer and take its time. Sizing each one for its job is most of the work.
This guide covers length, silence and fades, loudness, file format, importing, and library organisation, using the numbers PA Stadium Filter actually produces when it exports a clip. Where a streaming platform sets its own limit, the guide tells you to check the platform's current rules instead of quoting a number that may have changed.
The export panel on the streamer soundboard page gives a hint for stream alerts: they tend to work best at 2 to 5 seconds. That range exists because an alert plays over an on-screen animation instead of standing alone, and the animation usually decides when the sound can stop. A follower alert that outlasts its animation feels like a mistake, and one that ends halfway through feels cut off.
Soundboard clips and intro stingers have more room. The same export panel warns when a clip bound for Blerp runs past 30 seconds, because that's the length its note says Blerp accepts. Treat that as a ceiling for a soundboard drop, not a target. A long line wears out faster than a short one when you reuse it every stream.
One detail catches people out: the processed clip is longer than the recording you fed in. The effect adds a reverb tail after the last word, and the length of that tail depends on the preset. Ballpark adds 1.3 seconds, Arena 2.2, Outdoor 2.5, and Megaphone only 0.3. A two-second line run through Arena exports at about four seconds, which already sits inside the alert range with no room to spare. If the clip has to stay short, pick a preset with a shorter tail or trim the source first.
Dead air at the start of a clip is the most common reason an alert feels late. If the recording opens with half a second of room tone, the sound arrives half a second after the event, and on a fast alert that gap's easy to hear. Trim to the first breath or consonant of the line. A little space before the word is fine, as long as you left it on purpose.
The end needs different treatment. The reverb tail decays toward silence on its own, which is why a processed clip usually ends gently. A raw recording that stops abruptly can produce a click, because the waveform is cut while it's still moving. A very short fade in your editor removes the click without changing how the line sounds. Do it after you export, since PA Stadium Filter doesn't add fades of its own.
Trim the tail too if it runs longer than the alert needs. The tail is mostly low-level reflections, so cutting it early with a short fade loses little, and it brings the total length back inside the window the alert animation allows.
Every clip the tool exports passes through a peak normalisation step set to 0.891 of full scale, which is about minus 1 dB. A quiet recording is brought up until its loudest sample sits just under that ceiling, so two different clips end up peaking at the same level. A clip that already peaks above it is left alone, because the step only raises quiet audio. It's a peak match, not a loudness match. A clip with one sharp syllable and a clip that's steadily loud can share a peak and still sound very different in volume.
Compression is what narrows that gap. Each preset runs the voice through a compressor first, with strengths from 0.5 for Modern up to 0.8 for Classic, so the quiet and loud words sit closer together before the level is set. Megaphone adds hard clipping on top, with a distortion setting of 0.95, which flattens the loudest parts further. A heavily clipped clip tends to sound louder than its peak suggests, so give it a lower fader position in your streaming software than a clip made with a cleaner preset.
Leave headroom for stacking. A raid alert, a chat sound, and a soundboard drop can overlap, and when two sounds play at once their levels add. Clips that all peak near full scale will overload the stream mix when they land together. Set each source in your streaming software well below full scale, leave the master alone, and overlapping sounds won't distort.
The tool exports MP3 at a constant 192 kbps. That works out to 24 kilobytes of audio per second, so a four-second alert is under 100 kilobytes and a clip at the 30-second Blerp note is about 720 kilobytes. Files that small load instantly, which is why MP3 is the default for every target in the export panel except TikTok and CapCut.
WAV is the alternative. The WAV export is 16-bit PCM and keeps the processed audio uncompressed, so the file is several times larger than the MP3 of the same clip. Choose WAV when you'll be editing the clip further, because every MP3 re-encode costs a little quality. Choose MP3 for the finished file that goes into an overlay or soundboard. The panel offers both formats for TikTok and CapCut for this reason, since a video editor may want an uncompressed voice-over track.
A third consideration sits on the input side. The upload step accepts WAV, MP3, M4A, and OGG files. If a tool you use plays only one container, convert the exported file in an editor instead of changing anything here.
Streaming software handles these files in a few different ways. Overlay-based alert tools take an audio file for each event and tie it to an animation. Media sources in a scene play a file on demand or on a hotkey. Chat and web soundboards let viewers or moderators trigger clips. The same MP3 works in all three, but the right length differs: an alert has to be short, while a hotkey clip can run to the end of its joke.
After importing, trigger the clip from the software itself instead of relying on the preview in your file browser. Check that it starts when expected, that looping is off, and that it doesn't restart badly if triggered twice in quick succession. Each tool decides these things differently, and a clip that sounds fine alone can behave oddly once the software applies its own rules.
Third-party tools set their own caps on file size and length, and those change. Read the current limits of the platform or tool you're uploading to before you commit to a whole batch. The 30-second note in the export panel is a guideline written into the page, and the platforms don't guarantee it.
The export panel adds a suffix to each filename that identifies the target, such as _blerp.mp3. Keep that suffix. It'll tell you at a glance which version went where, which saves you from uploading a WAV to a place that wanted MP3 or sending a long version to an alert slot.
Beyond the suffix, name clips by event and variant, not by what the line says. Files called raid-short and raid-long sort together and say what they're for, while a file called welcome-final-2 tells you nothing six months later.
Keep one folder per purpose, and keep the original unprocessed recording next to the processed files. Because the tool runs in your browser and stores nothing, the recording on your own disk is the only copy. If a clip turns out too harsh, reprocessing the original with a different preset takes a minute, while fixing an already processed file rarely gets you back to a clean result.
Test every clip against the audio it'll play over. Run a game at its normal volume with your voice at the level you usually talk, then trigger the alert. The Megaphone preset sits in a narrow band between 1,000 and 2,400 Hz, which is where speech lives, so it competes with your voice and cuts through game audio more than a wide preset does. That helps a hype drop and gets tiring in a sound that plays often.
Check how the clip sounds on the viewer side as well. Recording a short test stream and listening on a phone speaker shows whether the clip stays clear once the stream audio is compressed. Presets with a higher low cut, such as Classic at 250 Hz, lose less low-end mud on small speakers than the ones that let more bass through.
Last, use only sounds you have the right to use. A line you record yourself and process here is yours. Music, film lines, and recordings made by other people don't become free because they passed through a filter, and platforms can mute or remove a stream over unlicensed audio. Check the current rules of the platform you stream on.