void scroll_playhead (bool forward);
void scroll_backward (float pages=0.8f);
void scroll_forward (float pages=0.8f);
void scroll_tracks_down ();
void scroll_tracks_up ();
void scroll_playhead (bool forward);
void scroll_backward (float pages=0.8f);
void scroll_forward (float pages=0.8f);
void scroll_tracks_down ();
void scroll_tracks_up ();