is your question about how to turn on the emulations in Alcohol or in which cases you have to turn them on or off ?
In the first screen after starting Alcohol you should search the Options-Tab on the left side of the screen and choose the "Emulation"-Label.
In the new window you'll see tree kinds of emulation with a description in which cases you should turn them on or off. After you have read them all you should look under a label called "Extra Emulation", because there are another 3 possible Emulations with a great description.
If your not shure which Emulation to use for your Game just enable all of them .
I hope this can help you!