function play(init, _skip_animation){

    //console.log("play", init);

    const state = (typeof init === "boolean" ? init : !playing);

    if(state === !playing){

        playing = playing ? clearTimeout(playing) : 1;
        toggleClass(player, "on", playing);
        _skip_animation || animate_bar(playing);
    }
}
@param {Event|boolean=} init
@param {boolean=} _skip_animation