If you've never experienced the joy of conveying four precisely-played tracks onto a single, rattly plastic cassette tape, prepare to see what you've been missing. The iconic Tascam Portastudio is coming to iPad in a very virtual way, a $10 app that presents a simplified replication of the original's decidedly more tactile controls. You can mix four inputs to stereo output, which is stored on a pretend cassette -- and can then share via iTunes or Soundcloud, which is rather more useful than a picture of a tape. It's available right now for the iPad
