Your problem is quite esoteric in a technical sense (it involves analog electronics, a foreign subject to most hobbyist emulation developers). There is one developer in all of MAME with anything like the necessary skill set, and as you might imagine he's quite valuable at his paid day job. He'll probably get to this eventually, but it may be many more years; he's currently fixing similar defects in the sound of IREM games like Moon Patrol and Kid Niki.
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