I may have seen some of those, but I'll look again in case I missed something. I've been looking at some commercial things already like Intuem and Metro SE. But I may check for some more free ones to make sure I don't buy something only to find myself marinated in free ones the very next day. Too many of the ones I do find turn out to be really bizarre things like "pattern" sequencers (whatever that is), or software specialized for drum sets or guitar. I won't be surprised if by the time I can find the perfect program I figure out how to program in Java and write my own MIDI sequencer for Mac. If a MIDI topic appears soon on CNET, it will probably be mine.
This will be one of the biggest humps to get over in making my Mac function like a good Windows.