Second - more gentle - Horn option

In certain situations, the main horn can sound too aggressive. For example, when in a car park and needing to gently alert a pedestrian, the AVAS speaker (the EV's noise generator) could play a chime instead. This feature could be triggered by a custom button or a combination of the custom button and the horn. https://www.youtube.com/watch?v=lv8wqnk_TsA