> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/gpcscripting/gpc-script-guide/learn-gpc/combos-and-fcombo.md).

# Combos and fcombo

A combo is a scheduled top-level block for producing timed output without blocking `main`. `combo` and `fcombo` use the same declaration form. Start a combo with `combo_run`, restart it from the beginning with `combo_restart`, and stop it with `combo_stop`.

{% code title="tap-square-combo.gpc" %}

```cpp
main {
    if(event_press(PS5_CROSS)) combo_run(TapSquare);
    if(event_press(PS5_CIRCLE)) combo_stop(TapSquare);
}

combo TapSquare {
    set_val(PS5_SQUARE, 100);
    wait(80);
    set_val(PS5_SQUARE, 0);
    wait(80);
}
```

{% endcode %}

`wait` and `call` are combo-only commands and must be at the root level of a combo. A called combo pauses its parent until the child finishes. `combo_run` does not restart a combo that is already running; use `combo_restart` when restart behavior is intended. Avoid recursive or cyclic combo calls. The complete combo reference covers all controls, status queries, suspension, timing, `wait`, and `call` with examples.


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