TAS Metra F40PH-3 soundset low idle Doppler issue

Although I haven't noticed this issue before but the low idle sound in TheAudioShack's F40PH-3 soundpack does not fade out as the user moves further from the locomotive, but rather that the sound cuts off at a certain distance and remains at the same volume within a certain radius. Since I'm not at my computer atm I cannot fully determine whether the bug is within the proxyxml file or that the .wav sound is stereo. Therefore I will hold off on buying the remaining F40PH soundpacks until this sound bug is resolved.
TheAudioShack website: http://theaudioshack.wix.com/theaudiosh ... udio/c16rb
TheAudioShack website: http://theaudioshack.wix.com/theaudiosh ... udio/c16rb