Is there any way to change the fm volume? I did some playing around in mame with the williams.cpp sound driver, and in the current settings, the fm volume is set to 0.10. Changing it to 0.15 seems to better match the video's fm volume. Otherwise the setting 1.0 (80 81 ?) setting might be the correct volume.
Here are some test vgms I used for checking:
https://www.dropbox.com/s/3pzfqbv10n2wj ... ms.7z?dl=1On a side note, the mamedevs have since lowered the volume of the oki adpcm output. The fm and dac are still the at the initial settings, however, so that should probably be taken into consideration if deciding to change the volume.
UPDATE: Here are a couple recordings from the modded mame.exe with the fm volume adjusted from 0.10 to 0.15 for comparison:
nbajam:
https://www.dropbox.com/s/q8cza28yxa656ul/nbaj.mp3?dl=1mk:
https://www.dropbox.com/s/z8mde4yp3voef ... o.mp3?dl=1Edit: I forgot to mention I muted the adpcm channel in the mk recording after the "Kano" callout, so as to hear the dac and fm better since that usually what's used for music. Didn't do so with NBA jam because there no vgm for that yet afaik and to compare with the video recording.