The is a conversion table between absolute MIDI notes and Hertz

(IMPORTANT: Note that ERTS version earlier than 3.22 require
 the FIXVESA patch because else absolute MIDI tone definitions
 are presented  11 MIDI notes higher than defined)

Midi     Frequence       Octave   Note
 13   =   17.31   C#
 14   =   18.36   D
 15   =   19.45   D#
 16   =   20.60   E
 17   =   21.84   F
 18   =   23.13   F#
 19   =   24.51   G
 20   =   25.94   G#
 21   =   27.51   A
 22   =   29.13   A#
 23   =   30.85   H
 24   =   32.71   C      1        1
 25   =   34.62   C#     1        2
 26   =   36.72   D      1        3
 27   =   38.91   D#     1        4
 28   =   41.20   E      1        5
 29   =   43.68   F      1        6
 30   =   46.25   F#     1        7
 31   =   49.02   G      1        8
 32   =   51.88   G#     1        9
 33   =   55.03   A      1        10
 34   =   58.27   A#     1        11
 35   =   61.70   H      1        12
 36   =   65.42   C      2        1
 37   =   69.24   C#     2        2
 38   =   73.43   D      2        3
 39   =   77.82   D#     2        4
 40   =   82.40   E      2        5
 41   =   87.36   F      2        6
 42   =   92.51   F#     2        7
 43   =   98.04   G      2        8
 44   =  103.76   G#     2        9
 45   =  110.05   A      2        10
 46   =  116.54   A#     2        11
 47   =  123.41   H      2        12
 48   =  130.84   C      3        1
 49   =  138.47   C#     3        2
 50   =  146.87   D      3        3
 51   =  155.64   D#     3        4
 52   =  164.79   E      3        5
 53   =  174.71   F      3        6
 54   =  185.01   F#     3        7
 55   =  196.08   G      3        8
 56   =  207.52   G#     3        9
 57   =  220.11   A      3        10
 58   =  233.08   A#     3        11
 59   =  246.81   H      3        12
 60   =  261.69   C      4        1
 61   =  276.95   C#     4        2
 62   =  293.73   D      4        3
 63   =  311.28   D#     4        4
 64   =  329.59   E      4        5
 65   =  349.43   F      4        6
 66   =  370.03   F#     4        7
 67   =  392.15   G      4        8
 68   =  415.04   G#     4        9
 69   =  440.22   A      4        10
 70   =  466.16   A#     4        11
 71   =  493.62   H      4        12
 72   =  523.38   C      5        1
 73   =  553.89   C#     5        2
 74   =  587.46   D      5        3
 75   =  622.56   D#     5        4
 76   =  659.18   E      5        5
 77   =  698.85   F      5        6
 78   =  740.05   F#     5        7
 79   =  784.30   G      5        8
 80   =  830.08   G#     5        9
 81   =  880.43   A      5        10
 82   =  932.31   A#     5        11
 83   =  987.24   H      5        12
 84   =  1046.75  C      6        1
 85   =  1107.79  C#     6        2
 86   =  1174.93  D      6        3
 87   =  1245.12  D#     6        4
 88   =  1318.36  E      6        5
 89   =  1397.71  F      6        6
 90   =  1480.10  F#     6        7
 91   =  1568.60  G      6        8
 92   =  1660.16  G#     6        9
 93   =  1760.86  A      6        10
 94   =  1864.62  A#     6        11
 95   =  1974.49  H      6        12
 96   =  2093.51  C      7        1
 97   =  2215.58  C#     7        2
 98   =  2349.85  D      7        3
 99   =  2490.23  D#     7        4
100   =  2636.72  E      7        5
101   =  2795.41  F      7        6
102   =  2960.21  F#     7        7
103   =  3137.21  G      7        8
104   =  3320.31  G#     7        9
105   =  3521.73  A      7        10
106   =  3729.25  A#     7        11
107   =  3948.97  H      7        12
108   =  4187.01  C      8        1