Cover
FT037s  26 40 63 89
FT038b3  4
FT038b5  7  8 17
FT040s  14 19 33 41 49 53 59 64 67 71 76 79 82
FT041s   2  5  9 10 11 12 13 15 16 21 27 30 31 32 34 35 42 43 44 45 46 48 50 51 52 56 57 65 66 69 70 72 75 84 90
MCK      1  3  6 18 20 22 23 24 28 29 37 38 47 58 60 61 62 68 73 74 77 78 80 81 85 88
NSD     39 87
S3M2NSF 25
Super   54
NT2     55 83
Other   36 86

Original
FT037s   5 23 25 26 40 43 47
FT040s  17 42
FT041s   2  4  7  8  9 12 13 14 18 19 20 21 24 29 30 32 33 34 35 36 37 38 39 41 44 45 48 49
MCK      1  6 10 11 16 27 28 31
NSD     22
IT2NSF  46
S3M2NSF 15
Super    3

        Engine                          Author          Cov / Orig
FT037s  FamiTracker 0.3.7 stable        jsr               4 +  7 =  11
FT038b3 FamiTracker 0.3.8 beta 3        jsr               1 +  0 =   1
FT038b5 FamiTracker 0.3.8 beta 5        jsr               3 +  0 =   3
FT040s  FamiTracker 0.4.0 stable        jsr              13 +  2 =  15
FT041s  FamiTracker 0.4.1 stable        jsr              35 + 28 =  63
MCK     MCK/PMCK/PPMCK                  various          26 +  8 =  34
NSD     NSD.Lib                         S.W.              2 +  1 =   3
IT2NSF  IT2NSF                          mukunda           0 +  1 =   1
S3M2NSF S3M2NSF                         mukunda           1 +  1 =   2
Super   SuperNSF                        mukunda           1 +  1 =   2
NT2     NerdTracker 2                   bananmos          2 +  0 =   2
Other   Other                           ---               2 +  0 =   2
        Total                                            90 + 49 = 139