I don't feel like spamming the whole sub-forum, so I'm just going to put this all in one thread.
Emulated system: Mac IIsi, sys 7.01

-Basilisk keeps starting in B&W mode
-"Cannot open ROM file" error when trying to run multiple BasiliskII

- How to change the Mac identifier (About this Mac... menu) from IIci to IIsi
-Basilisk II Sound doesn't work (at all!)

As adespoton mentioned to you in another thread, BasiliskII does not actually emulate a real Mac, so no Mac IIsi either. You probably mean that you use a Mac IIsi ROM file.

Can you change color depth in Monitors control panel while BasiliskII is running?

How do you do that? Different BasiliskII instances should each be in a different folder, each with its own additional files.

Only two flavours in BasiliskII, IIci and Quadra 900.

Indeed, not with System 7.0.1.

http://macgui.com/downloads/?file_id=20126

WishIWere is what I always used back in the day to change the gestalt ID. Really only useful for System 7.1.x where the About... window displays the computer name and an icon. You'll want to use it *after* doing any installations, as pretending to be a different computer may break comparability with your emulator if the wrong support files are installed.

Pretty sure there is a "modelid" setting in the BasiliskII_prefs file.

Right.

modelid 5 = IIci
modelid 14 = Quadra 900

I've created the following archive: http://macintoshgarden.org/apps/helper-extensions-bii -- it contains the extensions needed to get 7.0 through 7.1.2 supporting the shared folder, sound output and TrueType fonts in System 7.1 through 7.1.2 (including Performa versions).

Enjoy!