private final AbstractTrack getTrack(int trackNr)
    {
        if(trackNr >= 0)
            this.trackNr = trackNr;
        switch(this.trackNr)
        {
            default:
            case 0:
                return this.testtrack;
            case 1:
                return this.otrack;
            case 2:
                break;
            case 3:
                break;
            case 4:
                break;
        }
        // return null;
        return this.testtrack;
    }