void paint_panel (wxPaintEvent &);
void panel_sized (wxSizeEvent &);
void slider_moved (wxScrollEvent &);
void play_clicked (wxCommandEvent &);
void timer (wxTimerEvent &);
void paint_panel (wxPaintEvent &);
void panel_sized (wxSizeEvent &);
void slider_moved (wxScrollEvent &);
void play_clicked (wxCommandEvent &);
void timer (wxTimerEvent &);