Cover
FT027s   2 36
FT029s  32 33 49
FT030b  27
FT030s   8 16 17 20 31 34 38 39 43 48 50 51
FT030s2 21 41
MCK      1  3  4  5  6  7  9 10 11 12 14 15 19 22 23 24 26 28 29 30 35 40 44 45 46 47 53 54 55
IT2NSF  37 42
S3M2NSF 13 18 25 52

Original
FT029s   4  6 20 29
FT030b   1 15 26 30 35 50
FT030s   9 12 31 34 36 44 46 47 48
FT030s2  2  5  7 10 11 17 22 27 40 56
MCK      8 13 18 28 32 33 43 49 52
IT2NSF  14 19 21 23 24 38 41 51 55 58
S3M2NSF 16 25 37 39 42 45 53 54 57
NT2      3

        Engine                          Author          Cov / Orig
FT027s  FamiTracker 0.2.7 stable        jsr               2 +  0 =   2
FT029s  FamiTracker 0.2.9 stable        jsr               3 +  4 =   7
FT030b  FamiTracker 0.3.0 WIP           jsr               1 +  6 =   7
FT030s  FamiTracker 0.3.0 stable        jsr              12 +  9 =  21
FT030s2 FamiTracker 0.3.0 (fixed arp)   jsr               2 + 10 =  12
MCK     MCK / PMCK / PPMCK              various          29 +  9 =  38
IT2NSF  IT2NSF                          mukunda           2 + 10 =  12
S3M2NSF S3M2NSF                         mukunda           4 +  9 =  13
NT2     NerdTracker 2                   bananmos          0 +  1 =   1
        Total                                            55 + 58 = 113