I use Music Minus one to help with my practicing. This is of course far from perfect, but it's just an example of what I do with Music Minus One and my video camera to help me improve. They usually keep a very steady beat which can at times deter from your own rubato choices, but at least this will be similar somewhat to metronome practice.
Calvin Lee practicing (not performing) the Mendelssohn Violin Concerto Third Movement with Music Minus One.
For more info see http://www.calvinleeviolin.com/
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