I believe that the three are all mutually compatible. I could be wrong.
Also, it might sound odd coming from me since I wrote Sorcery's Toll, but I think Audacious Magery actually implements pretty much all the features of both ST and Spell Failure Chance in an integrated, INI-customizable way. So you may want to look into that instead.
hey, thank you Picador, I will try that one out as well, I love sorcery's toll! very good mod, great job there, thanks for sharing it and for your hard work writing it! :goodjob:
very good of you to point out Audacious Magery as well thank you