@@ -59,6 +59,7 @@ The `setting` dict has the same shape as the one used by `SettingActivity` and `
 - **`min`** (int): Minimum value for `"slider"` (default: `0`)
 - **`max`** (int): Maximum value for `"slider"` (default: `100`)
 - **`allow_deselect`** (bool): For `radiobuttons`, allow the user to un-select the active option (default: `False`)
+- **`selected_callback`** (callable): For `radiobuttons` and `dropdown`, called as `selected_callback(value)` every time the user picks an option (including re-tapping the already-selected radio), **before** Save. Use it to preview a choice live, e.g. play the sound the user just tapped. Independent of `changed_callback`, which still fires only after Save when the stored value changed. Exceptions inside it are logged and swallowed. (default: `None`)
 
 ## Result Contract
 
 
@@ -40,6 +40,7 @@ Each setting is defined as a dictionary with the following properties:
 ### Optional Properties
 - **`ui`** (string): UI type to use for editing. Options: `"textarea"` (default), `"radiobuttons"`, `"dropdown"`, `"slider"`, `"activity"`
 - **`ui_options`** (list): Options for `radiobuttons` and `dropdown` UI types. Each entry is a `(label, value)` tuple — the **label** appears on the radio button or dropdown row AND in the parent `SettingsActivity`'s value-label row beneath the title. The **value** is what gets stored in SharedPreferences. See [SettingsActivity → Display Labels for `ui_options`](settings-activity.md#display-labels-for-ui_options) for details.
+- **`selected_callback`** (callable): Optional live-selection hook for `radiobuttons`/`dropdown`: `selected_callback(value)` fires on every pick before Save (so a picker can preview, e.g. play a sound), while `changed_callback` fires after Save. See [InputActivity](input-activity.md).
 - **`placeholder`** (string): Placeholder text for textarea input
 - **`default_value`** (string): Default value to select or fill in
 - **`changed_callback`** (function): Callback function called when the setting value changes