How can I control the volume on the "default" sound... you put this engine+tender on the track (by the way, I LOVE the fact that sound has found its way into a really cool HO train) and it scares my youngest son out of the room... If I press a function button it quiets down and then is replaced with the "chuff" sound I believe - some of the bells are too quiet to be heard over what  I'll call the "background" noises... just think some are way too loud. Thanks in advance.
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