It does come with some example instruments and effects which can be modified. One can open a SynthKit project and mess around with it, but IIRC once a project is compiled it won't open in SynthKit anymore. Doing a raw decompile with some program would probably be a bit interesting but less useful than 56k code examples. What I wish was that I could get their other target modules so I could load new algorithms onto their other gear... but that's probably not going to happen. Still, they are good enough on the PCI card.
Indeed, SynthKit is a lot like that. There is visual patching, and you can type in 56k code if you know the syntax (I sure don't), and it is quite stable. It is a bit lower-level, more like MSP. It has an old-school feel, the whole environment was done in Think C.
Also I have what I think is an earlier version of TurboSynth, called SoftSynth, which I use on my SE. Can do weird partial editing and FM patches, and dump to samplers. My 68k Macs excel at communicating with old samplers.