AI voices for Twitch alerts and stream segments

A Twitch channel runs on two kinds of audio, and only one of them is you. The live half is the stream itself: your mic, your reactions, the thing people showed up for. The other half is a folder of files. The follow sound, the sub alert, the raid stinger, the "starting soon" bed, the BRB card, the outro, the recurring bit you play every time someone donates exactly 4.13. Those are assets. They get made once, dropped into OBS or Streamlabs, and then played back a few hundred times.

That second folder is where AudioProducer fits. It renders scripted, multi-voice audio ahead of time, which is exactly what an alert is. This guide is about building that folder well, and it is specific about where the line sits.

What this does, and what it is not

AudioProducer is a production tool, not a live one. It does not sit between your microphone and OBS, it does not change your voice in real time, and it does not read chat messages aloud as they arrive. If you want a bot that speaks a viewer's donation text at the moment it lands, that is a chat-TTS integration and it is a different product category.

What it does is turn a written script into finished audio with a separate voice per speaker, plus music beds and one-shot sound effects, and let you download the result as a file. For alerts, that is the right shape, because an alert is a fixed line played on a trigger. The variable part is the viewer's name, and almost nobody actually voices the name anyway -- the overlay renders it as text while the audio plays underneath. Say that part with your eyes, not your mouth.

Write the alert pack as one script, not ten one-offs

The usual way an alert pack gets made is one line at a time, months apart, whenever something annoys you enough to fix it. That is why most channels have a follow sound that is cheerful, a sub sound that is aggressive, and a raid sound that is somehow from a completely different show.

Write all of them in one sitting instead. Open one project, make each alert its own chapter, and put the whole set in front of you:

• new follower
• new sub, resub, gifted subs, sub train tier bumps
• bits and donations, with two or three tiers so a big one sounds different
• raid in, raid out
• first-time chatter, returning regular
• the channel-specific bit only your chat understands

Written together, they stop contradicting each other. You can see that the sub line is four seconds longer than the follow line and cut it, and you can hear that two of them use the same joke. A pack written in one pass sounds like a channel. A pack assembled over a year sounds like a folder.

Give the alert voice an actual character

An alert voice is a recurring character on your channel, which means it should have been cast, not defaulted. Assign a voice from the library, listen to the same line in three candidates, and pick the one that still works on the four-hundredth play. The library covers a wide range of ages and accents, and there is a preview on the Voices page, so casting is a ten-minute job rather than a guess.

A few things that hold up over a long stream:

• Lower energy than you think. A voice that is thrilled about a follow at hour one is exhausting at hour six.
• Short. Under two seconds for the common alerts. The sound is a punctuation mark, not an interruption.
• Contrast with you. If you are loud and fast, the alert voice should be dry and flat. If it sounds like you, viewers will hear it as you talking over yourself.

If you want the alert to be a second personality rather than an announcer -- a snarky co-host, a fake corporate PA system, a gremlin who lives in the overlay -- give it a name and keep a per-line emotion setting so the same voice can be smug on a small donation and genuinely moved on a big one.

Stream segments are the same job at a longer length

Starting soon, be right back, technical difficulties, ending screen. These are usually pure music with a static image, and they are a wasted minute of audience attention. A twenty-second voiced segment over the bed does more work: what the stream is today, what happened last time, what is coming next week, where the VOD goes.

They are also the easiest thing to keep current, because they are scripted. Rewrite the "starting soon" copy on Sunday, re-render, replace the file. Nothing in your scene collection has to change.

The same applies to anything with a fixed structure: rules cards, sponsor reads you actually have permission to run, a recurring segment intro, a "we are doing a charity thing this month" bumper. If you say it the same way every time, it should be a file.

Put the sound design in the same pass

Alerts almost always need two layers: a short musical or effect hit, and the voice on top. Doing those in separate tools is how you end up with a voice that is four dB quieter than the stinger and an alert nobody can hear over gameplay.

Place the effects and the music bed against the script in the same project, so the timing is written down rather than nudged by hand in an editor afterward. Auto-Assign Sounds will make a first pass at what belongs where, and you correct it -- which is faster than starting from an empty timeline. There is a longer treatment of that workflow in the guide to layering effects and music, and the restraint argument in when not to use them applies double to something that fires every ninety seconds.

Pauses matter more here than anywhere else. An alert with a half-second of air before the line reads as deliberate. One that starts on the first frame reads as a glitch.

Export each alert as its own file

Download per chapter, one file per alert, named for the trigger rather than the content: alert-follow.mp3, alert-sub-t1.mp3, segment-brb.mp3. Then point Streamlabs or the OBS alert box at each one. Your scene collection does not care how the audio was made.

Keep the project. When you rebrand, change the bit, or get tired of the voice, you are editing a script and re-rendering rather than reconstructing a year of decisions from the files themselves. The character list carries across projects too, so a second channel or an alt scene collection starts from the cast you already approved.

The honest limitation, up front

Everything above is pre-rendered. It cannot speak a viewer's message, it cannot react, and it will never be surprised. Anything genuinely live stays on your mic or on a chat-TTS bot. What this replaces is the folder of stock sounds every third channel is also using, and the afternoon you would otherwise spend recording twelve one-liners and re-recording them when your voice gets rough. The produced half of a stream is bigger than most streamers treat it as, and it is the half that can be good on purpose.

Adjacent formats are covered elsewhere: character skits and lore videos in the VTuber guide, upload-side narration in narrating YouTube videos, and the cue-driven case in voicing NPCs. The rest of the catalog, including guides that have nothing to do with streaming, sits in the full guide index at every article we have published.

Cut the follow sound first

Do not build the whole pack today. Take the single alert that fires most often on your channel, usually the follower one, write two seconds of copy, cast a voice in a free project, and render it. Put it live tonight and listen to it forty times in context -- that tells you more about the voice you want than any amount of previewing will. Then write the rest of the pack around whatever survives the stream.