Instructions for Added Functions:

• pattern(): takes in an equations that is used to map beats.
  • The equation must take in the form of "(val,i)=>_____".
  • Example: b.track4vol = pattern((val,i)=>1-i%2);
• setAll() : creates a 16-length array with the given value
  • Example: b.track4vol = setAll(1);
• backBeat(): takes no parameter, creates a track that sounds on beats 2,4, 6,... etc.
  • Example: b.track4vol = backBeat();
• p(): takes in a String parameter or a numeric value to change the pitch.
  • Numeric value: should be between 0 to 1(inclusive)
  • String value: should be a letter between A and G(inclusive)
  • Example: s.track6_thumb = p(0.5); s.track6_thumb = p("C");