>is that for the original cube or the later PC version of NeXTstep?
It is for the original (motorola68004processor) NeXT:
on the Intel platform , the NeXT midi driver A.P.I. changed extensively,
and I (or anybody else) have not taken enough time to fix the Midi 
code in csound to be compliant with the new midi libs on Intel. 

>Since Rhapsody runs native Mac binaries in addition to NeXTstep
I know some Rhapsody developers: perhaps we can get a compilation going
on their box. Yes: there will be O.S. emulation for Mac and old NeXT binaries.
I cannot recommend using such with Csound: I imagine the emulation 
overhead would be greatly noticable. I will get an "Original NeXT" binary
built for 3.47 soon, and upload it. But what really needs to be done is
the prot to the Intel savvy NeXt midi code. Dang, I should blow off my
employers and their petty market driven needs, and take time to port
the 10 or so NeXT midi lines to the new A.P.I...boy , I miss being
an academic, where such activity would be supported. Any tenure-track openings
I havn't heard of, guys? Sigh.