The Shliach Tzibur reads most prayers quietly until (about) the last verse, and then reads the last verse out loud (either for the congregation to follow along, or for them to answer Amen). Should the ...
When the leader gets to just before the Shacharis Amida, how should he say the blessing go-al Yisroel: aloud or saying the word Yisroel so the end of it cannot be heard?
In the repetition of the Amida, it seems (see Teshuvos Igros Moshe 3 (9), OC 104 (7), OC 125 Biur Halocho d.h. "elo shoskin ..") that the Chazzan should say the pesukim of Kedusho loud enough so that ...
In many siddurim, the text indicates a position, toward the end of each normal paragraph of prayer, where the Chazzan is supposed to start reading aloud, so that everyone knows when it's time to go on ...