Mac MIDI synthesizer (was frescobaldi on mac)

[james]

In the interest of not getting too far away from the original topic, what do 
the mac lion+ users use for midi playback? On my snow leopard machine (my main 
machine), I use Mighty MIDI, which has been wonderful. It really has only the 
features for listening to my note entry to make sure I entered everything 
correctly, plus the option to mute tracks and start at a specific bar. For the 
mountain lion computer, the best I've found is sweet midi, but it's a lot of 
overhead for those features (plus it costs, and for what I use it for, I don't 
see the purpose of spending money on it.) So I thought I'd ask: what do those 
of you here who have osx 10.7+ use for MIDI playback?