Post count: 1858

I’m not super familiar with video resolutions or volume controls so I can’t help you with those- but the tab key configuration menu is only a mame4all-pi/advmame feature, the lr-imame4all emulator is a retroarch emulator and as such uses the RGUI which can be opened by pressing select+x and from that menu you can also modify the video resolution and maybe the volume as well. see this page: https://github.com/RetroPie/RetroPie-Setup/wiki/MAME

this person had the same questions on video stuff and it seemed to work for him: