LaTeX solves elegantly this problem with the packages inputenc and fontenc. I just discovered that it is possible to use them with plain TeX, thus with M-Tx and PMX too. The single difficulty comes from the fact that these useful macros conflict with the definition let\:=\relax of mtx. Here is an example showing how to proceed:
8<------------- Pages: 1 Systems: 1 Meter: 2/4 Style: Singer
%% \input plainenc\relax\fontencoding{T1}\inputencoding{applemac}\let\:=\relax
%% [EMAIL PROTECTED]@[EMAIL PROTECTED]@ifnextchar#1#2#3{%
%% [EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@ifnch}
%% [EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@xifnch\else
%% [EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]
%% [EMAIL PROTECTED];[EMAIL PROTECTED] } \;
%% \def\;[EMAIL PROTECTED] \expandafter\def\; [EMAIL PROTECTED]@[EMAIL PROTECTED]@=12
%% \font\twelverm=pplr8t at 12pt\twelverm
{lyrics} Ô «~po-ème~» d'é-lève na-ïf sans âme
%%w130m c4 d | e f | g f | e d | c2 L: {lyrics} 8<-------------
Since I don't know how your browser translates accented letters, I send a pdf file too.
Olivier
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lyrics.pdf
Description: Adobe PDF document