PlaybackEngine *playback_engine = mwindow->cwindow->playback_engine;
if( playback_engine->is_playing_back )
playback_engine->stop_playback(1);
PlaybackEngine *playback_engine = mwindow->cwindow->playback_engine;
if( playback_engine->is_playing_back )
playback_engine->stop_playback(1);