# useDemoSource

> The sound a device plays: the one chosen in its session, such as from a preview's bar, else the one that shows best what the device does. It tells the session its default, so a bar can offer the choice only where there is one. Outside a session it is always the default.

```bash
npx shadcn@latest add @audio-ui/use-demo-source
```

```ts
import { useDemoSource } from "@/hooks/use-demo-source";
```

- Files: `hooks/use-demo-source.ts`
- Depends on: `demo-sound`, `use-audio-session`; npm: nothing
- Used by: `block-device-chain`, `use-device-loop`

| Export | Kind | What it is |
| --- | --- | --- |
| `useDemoSource` | function | The sound a device plays: the one chosen in its session, such as from a preview's bar, else `fallback`, the one that shows best what the device does. |

## Usage

The sound a device plays: the one chosen in its [session](/docs/hooks/use-audio-session), such as from a preview's bar, else `fallback`, the one that shows best what the device does. It tells the session its fallback, so a bar offers the choice only where there is one.

```tsx
import { useDemoSource } from "@/hooks/use-demo-source";

const name = useDemoSource("groove"); // one of DEMO_SOURCES
```

The sounds are [`demo-sound`](/docs/lib/demo-sound)'s, made in code. Outside a session it is always `fallback`.