\input musixtex
\instrumentnumber2
\setstaffs12
\setstaffs21
\setsize2\tinyvalue
\setclef1{\bass\treble}
\setclef2\treble
\font\appogfont=musix11 at 9pt
\makeatletter
\def\verytinynotesize{\let\musixfont\appogfont\comput@specifics}
\makeatother
\def\verytinyvalue{.4}


\startpiece
\NOtes\qa{LM}|\qa{ef}&\qa{jk}\en
\notes|\tinynotesize\grcu b&\tinynotesize\grcu k\en
\NOtes\qa{JK}|\qa{cd}&\qa{lm}\en
\notes|\tinynotesize\grcu b&\verytinynotesize\grcu k\en
\NOtes\qa{LM}|\qa{ef}&\qa{jk}\en
\notes|\multnoteskip\tinyvalue\tinynotesize\ibbu1m1\qb1{mn}\tqh1o%
&\multnoteskip\verytinyvalue\verytinynotesize\ibbu1m1\qb1{mn}\tqh1o\en
\zendpiece
\end

