Struct Output 

pub struct Output {
    pub midi: Vec<ActionStep, 32>,
    pub display: Vec<DisplayEvent, 2>,
    pub leds_changed: bool,
    pub preset_changed: bool,
    pub bpm: Option<u16>,
    /* private fields */
}

Result of processing an input event through the Controller. Contains everything the caller needs to emit — no further logic required.

Fields

midi: Vec<ActionStep, 32>

MIDI actions to emit (includes on_enter/on_exit/recall on preset switch).

display: Vec<DisplayEvent, 2>

Display events (overlays, hints).

leds_changed: bool

Whether LED state changed and needs re-rendering.

preset_changed: bool

Whether a preset switch occurred (caller may need to update display).

bpm: Option<u16>

BPM computed from tap tempo (if any).