I only really downloaded this for the tuner. I might be able to make use of some of the rest of it later, but for now, I have to say the tuner is useless. I'm only using it with the internal microphone on my MacBook, which took a bit of fiddling about in the Midi Setup Utility (then the tuner itself must be quit and restarted, something its help dialog fails to mention).

The main "needle" display of the tuner doesn't work - it hovers around at the -50 end of the scale no matter how delicately or roughly you tune. Since this isn't giving you a worthwhile indication of tune, you have to go by either the numbers, which change too rapidly and jumpily to be useful, or by the colour, which is equally erratic.

The programmer needs to a) fix the needle display so it works, and b) put in some sort of damping time-constant so that the thing isn't so jittery. Then it might be OK. Also, a better default configuration would be to use the built-in microphone right from the get-go without any further setup needed - this is how most people are likely to use it initially.