How to use oldstandard package properly?

Question

I have just downloaded the OldStandard.sty package avaible on CTAN. Reading the user's manual it seems the font should be ready for the math mode too. However, in the mwe below you can see the equations are typeseted in Latin Modern. Is it possible to change this? I had thought about using mathspec.sty package but I think it will be better if we can avoid it. Does OldStandard.sty package include current symbols as the ones provided by \in, subset\{\cup etc?

Another thing I would like to ask you for is about the italic 'f'. The Old Standard font has loads of files in CTAN. In particular, the .tfm file OldStandard-Italic-sup-ly has an alternative 'f' (character number 131). How can I use it instead of the normal ins such a way the ligatures are preserved?

Thanks

MWE

\documentclass{article}

\usepackage{fonttable}
\usepackage{OldStandard}

\newcommand{\abc}{abcdefghijklmnopqrstuvwxyz }
\newcommand{\ligs}{ff fi fff ffi fl ffl}

\begin{document}
\centering

\fonttable{OldStandard-Italic-sup-ly1.tfm}

\newpage

\abc \ligs

\textit{\abc \ligs}

\end{document}

Answer 1

The question is very unclear but the legacy pdftex LY1 encoding has \textflorin in position 131. The florin character is ƒ Unicode U+0192 so as far as I can tell, you want:

\documentclass{article}

\usepackage{fontspec}
\setmainfont{OldStandard-Regular}
\begin{document}

efgƒ

\end{document}