export interface Note {
    /**
     * The keyCode of the key being pressed down.
     */
    code: KeyboardEvent['code'];
    /**
     * The midi number of the note.
     */
    note: number;
    /**
     * The note name.
     */
    name: string;
    /**
     * The frequency of the note between 0 and 20,000.
     */
    frequency: number;
    /**
     * On note down, the current velocity.
     * On note up, 0.
     */
    velocity: number;
    /**
     * Whether the key is currently being pressed down.
     */
    isActive: boolean;
}