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I'm running the trial version of SmartMusic. It's a very simple, and very cool idea.
Unfortunately, not all of their accompaniment features are that intelligent. For example, if you "wait-for notes" (marked as blue), then the accompaniment stops playing until it hears you play the note.

But because it doesn't trust you by default, it drags the song behind. I estimate the lag to be about 0.1s, which is a significant annoyance. This should be really easy to fix: just keep playing normally until the program knows for sure that a mistake has been made (i.e. it should take the lag into account). Humans normally trust the soloist to perform correctly, and if they didn't, the song would drag, just like it does with SmartMusic.
I do have to admire their beat induction, though, if only because I've never seen this before: the accompaniment follows the soloist's tempo rather well: it tested this myself by playing faster. The only problem are the "wait-for" notes: I guess the solution is to disable them.
I also suspect that it's not easy to add your own MIDI file, even after you buy the product.
Unfortunately, not all of their accompaniment features are that intelligent. For example, if you "wait-for notes" (marked as blue), then the accompaniment stops playing until it hears you play the note.

But because it doesn't trust you by default, it drags the song behind. I estimate the lag to be about 0.1s, which is a significant annoyance. This should be really easy to fix: just keep playing normally until the program knows for sure that a mistake has been made (i.e. it should take the lag into account). Humans normally trust the soloist to perform correctly, and if they didn't, the song would drag, just like it does with SmartMusic.
I do have to admire their beat induction, though, if only because I've never seen this before: the accompaniment follows the soloist's tempo rather well: it tested this myself by playing faster. The only problem are the "wait-for" notes: I guess the solution is to disable them.
I also suspect that it's not easy to add your own MIDI file, even after you buy the product.