resolve ambiguous constraint for record button
tap to play

- if no cell's been selected, it selects cell and begins playing audio
- if selecting the cell that's already selected, will pause currently
  playing audio
- if there's already a selected cell that's playing it stops it and
  plays the one you just selected
- play button still works as before, 1st plays, 2nd pauses, except the
  1st scenario will now never occurr