audio_player_set_vol( &audio_player0, vol0*vg.time_rate );
audio_player_set_vol( &audio_player1, vol1*vg.time_rate );
audio_player_set_vol( &audio_player2, vol2*vg.time_rate );
audio_player_set_vol( &audio_player0, vol0*vg.time_rate );
audio_player_set_vol( &audio_player1, vol1*vg.time_rate );
audio_player_set_vol( &audio_player2, vol2*vg.time_rate );