Changes from MusiXTeX 120 to 121: + adjusted the offsets and/or vertical positions for some tremolos + moved \lastbarpos\lin@pos after calls to \Writ@meters to correct \centerbar positioning + copied the definition of \Hpause from musixlit.tex + introduced \Changeclefs, \cHpause and \centerHpause + replaced \smalltype\it by \txtfont in octave clef commands + moved definitions of \txtfont into \comput@fonts + added support for piano-pedal bracket notation