Assuming you know how to compile, do the following: Open the file namcos22.c located in "yourpathtothesource\src\mame\drivers", then edit it with notepad or whatever text editor you feel comfortable with. Start searching with the key "raw_p", that would lead you to a few lines before the sound hardware initialization.
/* sound hardware */ MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
MCFG_C352_ADD("c352", SS22_MASTER_CLOCK/2) MCFG_SOUND_ROUTE(0, "rspeaker", 1.00) MCFG_SOUND_ROUTE(1, "lspeaker", 1.00) MCFG_SOUND_ROUTE(2, "rspeaker", 1.00) MCFG_SOUND_ROUTE(3, "lspeaker", 1.00)
Change the values as you like, close, save and compile
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