void activate();
void create_track_scroll(int view_x, int view_y, int view_w, int view_h);
void create_sample_scroll(int view_x, int view_y, int view_w, int view_h);
void activate();
void create_track_scroll(int view_x, int view_y, int view_w, int view_h);
void create_sample_scroll(int view_x, int view_y, int view_w, int view_h);