Reply To: On What Siddur is the Artscroll Based?

While, I believe, the Roedelheim siddur formed the nusach ha’tefilah as far as dikduk is concerned, Nusach Ashkenaz is largely built, I think, on the nusach of Rav Shabsi Sofer and Rav Hirsh Shatz. Even further back, it is based on the nusach of one of the Geonim. Some source indicate that Nusach Ashkenaz has its roots in what they call Nusach Bavli versus Nusach Yerushalmi. It is interesting to note that many of the changes we make on Shabbos (hashkiveinu and in the berachah achas me’ein sheva) on Yom Tov in avodah in chazaras ha’shatz (she’oscha livadcha) is based on the Nusach Yerushalmi.