Are you using VPX’s 7.1 Surround audio option? If so, the BG & PF sounds have crosstalk towards the top of the playfield. Here is a link to a table I built, VPX Playfield Sound Tester, and you can test your playfield sound system to verify what you noticed: https://1drv.ms/u/s!ApvHwnyEr2s-gRlTu2gZc9Y3DWPw?e=wF0ds1
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