There are a few devices available to assist in music transcription. I do not believe they are as automated as you would like. For example, Reed Kotler has both hardware and software solutions to assist in transcribing. You can check his stuff out at
http://www.reedkotler.com. Um, I'm not a music dealer, and I haven't used the stuff on Reed's pages. So, I'm afraid I can't compare and contrast these to any other device on the market.
I have used notation programs like Finale and Encore that deal with moving from a MIDI keyboard to notation. I abandoned the use of these programs because of their inability to accurately portray a composer's notational intent. These days I work in pencil and am much happier because I don't put time into battling software deficiencies and/or bugs. I put it into the music.
A word of friendly advice: If you read through somebody else's transcription you will probably learn very little about the music. If you do the transcription yourself you'll learn a lot.
