gistfile1.rbx

def note_to_freq( note_num )
  base_note_num = note_num - 69
  440.0 * Math.exp( 0.057762265 * ( note_num - 69 ) )
end

60.upto(72) {|n| puts note_to_freq(n) / note_to_freq(60) }
1.0
1.05946309430986 # 61, C#
1.12246204820462 # 62, D
1.18920711483625 # 63, D#
1.25992104965971 # 64, E
1.3348398538586 # 65, F
1.41421356197715 # 66, F#
1.49830707638728 # 67, G
1.58740105137563 # 68, G#
1.68179282980115 # 69, A
1.78179743544925 # 70, A#
1.88774862439444 # 71, B
1.99999999888011 # 72, C4. really is 2, this is the only legit rounding error here