That's one good reason. Software playback can also show you how correct the rhythm is, when things get rhythmically complex. Band in a Box [which I use a lot for lead sheets] isn't great for rhythmic complexity. It does allow you to tap in rhythms using the regular computer keyboard. I try to get the charts close to accurate and let better players tweak them on gigs :^) Its a pretty good system if you hire people to back you up.
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