Airbag Sound Module

This sound module could help your rig's scale appearance!

This device features a speaker that watches the servo signal that raises and lowers your truck  It plays either an air compressor sound or an air escaping sound to simulate a set of airbags operating.
It is meant to be used with a two-position channel (for up/down).

The servo slower product can be used with it to help complete the scale look and sound of your rig.

Here's a demo: