Compiled the single stage recording of the AD8604 with the LF353.  The AD8604 still has the original cell phone interference.  Suspect the sound of the freeway was not different, but we're still hearing the effect of less noise on a normalized signal.  The freeway is 1 mile away & an ever present sound.  The freeway sound is manely affected by fog.  Fog makes it go away.  Clear nights make it very loud.  Never noticed its timbre changing on 2 different clear nights.