neil9000

When you say several systems now all show the same shader are those systems all using the same core, ie gameboy, gameboy color, gameboy advance? If so it sounds like when you applied the shader you saved it as a "core override" applying it to all systems that use that core (or you may of even saved a "global override" meaning its now used for everything. You need to load a game that uses the shader, go into quick menu/shaders and click on the button that is a "remove override" it will be named differently depending on what sort of override it was. In future you should be using "content directory overrides" for things like this, Sega is a good example of this, the genesisgxplus core emulates sg-1000, master system, megadrive, mega cd, pico, and game gear, you wouldnt want the same settings for all those systems, especially game gear and the home consoles, so you save a "content directory" override. This saves those settings for any game loaded from the same folder as the current game, so if you had a game gear game loaded in future any game loaded from that same game gear rom folder will get the same settings, but something from the megadrive folder wouldnt.

Why not just set the hotkey in retroarch?

You can just delete the license.xml file in the Launchbox folder, and replace it with a legitimately purchased one. https://www.launchbox-app.com/premium

If its a separate button away from the actual controls are you sure its a "controller" button and not a keyboard key? It may just be a "escape" key.

I havent used demul in years, but if i recall what we used to do was add two demul emulators to launchbox with different names like "demul dreamcast" and "demul arcade" as different settings are required for arcade games.

Set controller combos in Retroarch for save state and load state and use the button combo while in game. Some advice though, DO NOT rely on save states, when a emulator updates they can, and will break, always use actual in game saves via the games save system if you actually value your saves.

The "third" menu is the game details screen and can be turned off in the settings, it can also be mapped to any button/key.

We cannot help you with that, downloading roms you do not own is illegal.

https://www.launchbox-app.com/premium/lost-license

Any reason you are using the worst Saturn emulator there is? My advice would be to use the far superior mednafen/beetle Saturn emulator/retroarch core.

That is expected behaviour for the MAME "Fullset" importer it expects a fullset, not a limited collection of roms which 700 certainly is. Also yes it does not actually look at the files you have in the folder, as any fullset has the same games, it gets that working games list directly from the mame.exe, and adds the rom names to Launchbox, not the roms themselves. If you have a limited curated set of mame roms you need to use the standard rom importer and not the mame fullset importer.

Launchbox has nothing to do with your controls in emulators.

Always makes me laugh, seems to be absolutely essential that the user be on the latest version of Launchbox, but at the same time is using a OS that came out 15 years ago and is completely unsupported at this point, why one standard for one bit of software and a different standard for the other? Nobody should be using these old operating systems at this point, they are a security issue as they are end of life and no longer updated to stop current day threats.

Set mame's "default.cfg" to read only, then it cant be altered.