function scr_rhythmgame_beatcheck(arg0 = false)
{
    var _update = 0;
    if (signature_count > 1)
    {
        if (signature_index < (signature_count - 1) && trackpos > signature_time[signature_index + 1])
        {
            signature_index++;
            _update += 1;
            signature = signature_change[signature_index];
            beatstart = signature_time[signature_index];
        }
        else if (arg0 && signature_index > 0 && trackpos < signature_time[signature_index])
        {
            signature_index--;
            signature = signature_change[signature_index];
            beatstart = max(bpm_time[bpm_index], signature_time[signature_index]);
        }
    }
    if (bpm_count > 1)
    {
        if (bpm_index < (bpm_count - 1) && trackpos > bpm_time[bpm_index + 1])
        {
            bpm_index++;
            _update += 2;
            bpm = bpm_change[bpm_index];
            notespacing = 60 / bpm;
            meter = notespacing * signature;
            beatstart = bpm_time[bpm_index];
        }
        else if (arg0 && bpm_index > 0 && trackpos < bpm_time[bpm_index])
        {
            bpm_index--;
            bpm = bpm_change[bpm_index];
            notespacing = 60 / bpm;
            meter = notespacing * signature;
            beatstart = max(bpm_time[bpm_index], signature_time[signature_index]);
        }
    }
    if (_update > 0)
    {
        with (obj_rhythmgame_chart)
        {
            if (_update != 2)
            {
                signature = other.signature;
                signature_index = other.signature_index;
                if (confidence < 1)
                    conf_decay = 10;
            }
            if (_update >= 2)
            {
                bpm_index = other.bpm_index;
                bpm = other.bpm;
                notespacing = other.notespacing;
            }
        }
        with (obj_music_event_manager)
        {
            time_offset = max(other.bpm_time[other.bpm_index], other.signature_time[other.signature_index]);
            bpm = other.bpm;
            signature = other.signature;
        }
    }
}