Has anyone ever tried to alter the "Chug chug" sound of a Bachmann sound board?

I'm trying for a constant steady "White noise" sound... I'm just messing around with a few ideas I have for a newer "Diesel" engine and the chug chug would be out of place.

This is the 9V battery operated unit, not the DCC

I find it extremely difficult to put a 9 volt battery in one of my N scale locos, so count me out of having done this...

You can disguise a 9V battery as some kind of flat car load I know I've used AA and AAA batteries in N