The SoundCanvas is still and excellent sound module. Although old, it can still produce professional results (the piano sounds are very good, for instance). I have one and use it in my home recording studio all the time. Bars & Pipes even has a special module for picking patches from an SC-55. Of course, I used a regular Amiga MIDI interface. My A2000 died in August, but now I am using UAE and a PC to run Amiga music software (still with the SC-55 and a lot more!).
Now....as to getting it connected to a MiniMig. That is the big question. As an Amiga musician, I find it a bit frustrating that there is so little information about MIDI compatibility from the makers of the new Amiga clones (A-Clone, MiniMig, Natami, Sam440). Of course, most of these people are not musicians....but it would be nice to know if and what MIDI interfaces will work with these machines? The old Classic interfaces? New PC/Mac USB interfaces?