i have no 060 setup here in my Winuae setup so i cannot say exactly.
on my 030/882 wb/kick 3.1 system - the version from amigafuture does work here out of the box.
the program opens some math libs: mathffp, mathtrans, mathieeedoubbas (shown by snoopdos) - maybe some of the libs are 060 specific in your setup and ffmsynth conflicts with the somehow.
maybe another 060 lib or something - but as you know - never touch a running system.
if you have a backup of your system and you can do some experiments - you could try the 060.library from the aminet mmu packages:
http://aminet.net/package/util/libs/MMULib
http://aminet.net/package/util/sys/Mu680x0Libs
there are also different 882/060 optimized math library package, but i cannot give a good advice here.
btw: once the program is working, you have to open a voice file and press [calc] and use the keyboard to hear the instrument
