Voices
Choose the voice Nebula speaks with on calls, design a new one, or clone your own from a recording — then tune your mic, speaker, and noise cancellation.
You pick how Nebula sounds. Browse the voice library, design a voice from a description, or clone one from a short recording — then set your default so every call starts with it.
Choosing a voice
The voice library lives in your Settings, under your account. Browse or search the catalog, preview anything that looks promising, and set one as your default.
Your default is yours — each person in a workspace picks their own, so the voice you hear isn't the voice your teammates hear.
Designing a voice
Describe the voice you want and Nebula builds it — the accent, the pace, the character of it. Preview the result, and save it to your library if it's right.
I want a voice that sounds calm and unhurried, low register, slight British accent.
Here are three takes on that. Preview each one and save the one you like — I'd start with the second, it holds the low register best at speed.
Cloning a voice
Upload a recording and Nebula builds a voice from it. Keep the sample clean — one speaker, no music, no crosstalk — and you'll get a much closer match.
| Formats | mp3, mp4, wav, ogg, webm, flac |
| Size limit | 25 MB per upload |
Only clone a voice you have the right to use — your own, or one you have explicit permission for.
Wake words
On a call your agent listens the whole time, but how it responds depends on its posture. Wake words matter most in a group call, where an active agent deliberately stays out of the room's back-and-forth: saying one is how you tell it that this turn is for it, and it speaks up. On a one-on-one call your agent already answers every turn, so you rarely need one.
Your agent's own name is always recognized as a wake word — you can't turn that off. Beyond that, you control the triggers in Settings → Voice.
Saying "Nebula" wakes your agent by default. Turn off Respond to "Nebula" if the name comes up too often in conversation — the agent's own name still works.
Add your own — a nickname, a project name, whatever you actually say. Up to five, each 2–40 characters, matched as whole words and case-insensitive.
Your wake words are yours, per workspace, and apply to the calls you start there. Mid-call, the in-call settings let you flip Respond to "Nebula" for that session only — it doesn't touch your saved defaults. Adding or editing custom words happens in Settings → Voice.
Mic, speaker, and noise cancellation
Your audio devices have their own settings page, separate from the voice library.
Pick which mic to use, or leave it on System default. If you haven't granted mic permission yet, your devices show up unnamed and an Allow access button appears — grant it and the real names fill in.
Pick where call audio plays. Same list your browser exposes.
Filters out background noise — keyboards, rooms, traffic. It's on by default, and it applies from the next call you start. You can also flip it mid-call from the call's settings.
These settings are per browser, not per account — set them again on a new machine. Noise cancellation depends on browser support, so the control won't appear where it isn't available.
Related
Live camera
Turn on your camera in a Nebula call and let your agent see what you show it — hold something up, read a label, or check what you are pointing at.
Agents in Nebula
Agents are AI workers shared across your workspace. Every member can chat with them, every channel can include them, every automation can call them.