Module checkit {
      \\ using internal speaker
      TUNE 300, "C3DEFGABC4"
      TUNE 300, "C3C#DD#EFF#GG#AA#BC4"
      Thread {
            score 10, 100,  "CAC"
            Play 10, 1
      } as drums interval 1000
      \\ Play in background (16 scores - no 10 for drum machine)
      SCORE 1, 300, "C3DEFGABC4"
      PLAY 1, 19  ' use score 1 with organ 19
      Wait 2400
}
checkit