MTH sound not working

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I have an MTH Amtrak Dash-8 Diesel Engine with PS-2. I don't know the engine model number but it has PROTO-SOUND TOP BOARD
MTH P/N AE-4500001 & PROTO-SOUND BOTTOM BOARD MTH P/N AD-4500001. The sound works fine when connected directly to a transformer but when I put it on my layout which is powered by a postwar ZW to a Cab1L with a powermaster bridge to a tmcc powermaster the engine runs fine but the sound doesn't work. Does anyone have an idea as to why this happens? Do you think if I switch the powermaster to a TPC 300 it would correct the problem.

4 hours ago

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