General MIDI instruments
===

  0 : Acoustic Grand                           64 : Soprano Sax
  1 : Bright Acoustic                          65 : Alto Sax
  2 : Electric Grand                           66 : Tenor Sax
  3 : Honky-Tonk                               67 : Baritone Sax
  4 : Electric Piano 1                         68 : Oboe
  5 : Electric Piano 2                         69 : English Horn
  6 : Harpsichord                              70 : Bassoon
  7 : Clavinet                                 71 : Clarinet
  8 : Celesta                                  72 : Piccolo
  9 : Glockenspiel                             73 : Flute
 10 : Music Box                                74 : Recorder
 11 : Vibraphone                               75 : Pan Flute
 12 : Marimba                                  76 : Blown Bottle
 13 : Xylophone                                77 : Skakuhachi
 14 : Tubular Bells                            78 : Whistle
 15 : Dulcimer                                 79 : Ocarina
 16 : Drawbar Organ                            80 : Lead 1 (square)
 17 : Percussive Organ                         81 : Lead 2 (sawtooth)
 18 : Rock Organ                               82 : Lead 3 (calliope)
 19 : Church Organ                             83 : Lead 4 (chiff)
 20 : Reed Organ                               84 : Lead 5 (charang)
 21 : Accoridan                                85 : Lead 6 (voice)
 22 : Harmonica                                86 : Lead 7 (fifths)
 23 : Tango Accordian                          87 : Lead 8 (bass+lead)
 24 : Nylon String Guitar                      88 : Pad 1 (new age)
 25 : Steel String Guitar                      89 : Pad 2 (warm)
 26 : Electric Jazz Guitar                     90 : Pad 3 (polysynth)
 27 : Electric Clean Guitar                    91 : Pad 4 (choir)
 28 : Electric Muted Guitar                    92 : Pad 5 (bowed)
 29 : Overdriven Guitar                        93 : Pad 6 (metallic)
 30 : Distortion Guitar                        94 : Pad 7 (halo)
 31 : Guitar Harmonics                         95 : Pad 8 (sweep)
 32 : Acoustic Bass                            96 : FX 1 (rain)
 33 : Electric Bass(finger)                    97 : FX 2 (soundtrack)
 34 : Electric Bass(pick)                      98 : FX 3 (crystal)
 35 : Fretless Bass                            99 : FX 4 (atmosphere)
 36 : Slap Bass 1                             100 : FX 5 (brightness)
 37 : Slap Bass 2                             101 : FX 6 (goblins)
 38 : Synth Bass 1                            102 : FX 7 (echoes)
 39 : Synth Bass 2                            103 : FX 8 (sci-fi)
 40 : Violin                                  104 : Sitar
 41 : Viola                                   105 : Banjo
 42 : Cello                                   106 : Shamisen
 43 : Contrabass                              107 : Koto
 44 : Tremolo Strings                         108 : Kalimba
 45 : Pizzicato Strings                       109 : Bagpipe
 46 : Orchestral Strings                      110 : Fiddle
 47 : Timpani                                 111 : Shanai
 48 : String Ensemble 1                       112 : Tinkle Bell
 49 : String Ensemble 2                       113 : Agogo
 50 : SynthStrings 1                          114 : Steel Drums
 51 : SynthStrings 2                          115 : Woodblock
 52 : Choir Aahs                              116 : Taiko Drum
 53 : Voice Oohs                              117 : Melodic Tom
 54 : Synth Voice                             118 : Synth Drum
 55 : Orchestra Hit                           119 : Reverse Cymbal
 56 : Trumpet                                 120 : Guitar Fret Noise
 57 : Trombone                                121 : Breath Noise
 58 : Tuba                                    122 : Seashore
 59 : Muted Trumpet                           123 : Bird Tweet
 60 : French Horn                             124 : Telephone Ring
 61 : Brass Section                           125 : Helicopter
 62 : SynthBrass 1                            126 : Applause
 63 : SynthBrass 2                            127 : Gunshot

Use these with the `program` attribute in `voice` blocks.