I am using qa ZW, and when I press the horn button, the horn blows very nicely in its 6 second sequence. Holding the horn button in for 1 second as the instructions indicate or 3 secfonds as you indicate does not activate the bell. No time held in seems to activate the bell. If I reverse the wires to the track, pressing the horn button activaes the bell as well as shuts it off, but no horn??
Paul

What signal is required to activate the horn and bell sounds from the true blast sound board??