I wish there was some way to operate the bell using the Xbox or PS controller. This existed is TSW2020 but has sadly been removed from TSW2. It seems like it would be possible to map it to one of the secondary/alternate functions, much like you have to hold X on the Xbox controller in order to apply sand. While on the topic of controller functionality, it would also be an improvement if more than one horn tone could be accessed while using the controller. As it now stands, the only way to operate the bell or get full use of the horn is to go into the cab view and hover over the appropriate control with the cursor.