Audio glitches with level crossing

Approach_Medium

Trainz Addict
Hi;
I have a test track with one level crossing - <kuid2:39134:101595:2> "Grade Xing US Inc. 2L 1T". When the crossing is first activated, there is a "pop" on every cycle of the bell sound. I thought this was a glitch in the .wav sound file, but the pop disappears once the gates are lowered and the bell is still ringing.
I get the same effect whether I use my system (Windows 7 x64 SP1) built-in sound card (Realtek Hi-Def) or my Behringer AI on USB, so I know it's not my hardware.

Has anyone else heard this?

Thanks
CP
 
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