Everything you hear here comes from running the cartridge's own sound engine (VUELCA_SONIDO, 0x7A7A, and PONE_SONIDO, 0x79E5, which hands it the channels; the interrupt calls it at 0x4047) on an emulated Z80, frame by frame at 60 per second, just as the game calls it. What the engine writes to the PSG is turned into sound with an AY-3-8910 (tools/musica.py). Each MP3 is the whole piece up to where it starts again, plus 8 seconds of the repeat fading out; those that do not repeat end where the engine ends.
The PSG writes have been compared frame by frame with those of openMSX (C-BIOS MSX1 japonés). In every frame the PSG ends up the same:
The timbre is not checked: it is a textbook AY-3-8910, not a recording of the emulator. The probes are tools/omsx_psg.tcl and tools/coteja_psg.py.
PIDE_SONIDO takes the number in A and only sounds with a game running (bit 6 of 0xE002) and the plane not dying; PONE_SONIDO skips those checks and shares the sound among the channels. Low numbers are effects and from 0x88 up there is music. Each channel takes twelve bytes from 0xE018 and 0xE03C holds the copy of the PSG mixer, which start-up leaves at 0xB8. The tracks marked «in the table» are in the track table but no routine asks for them with an ld a; 0x9A and 0x9B, minutes long and nearly without notes, are left out. Only one piece has been checked against openMSX, 0x93; the rest come out of the same engine but each has not been compared.
The start-up tune (0x93)
Asked for by ESTADO_3; lasts 4.9 s.
Game over (0x99)
Asked for by FIN_DE_PARTIDA; lasts 4.7 s.
The giant's tune (0x88)
Asked for by GIGANTE_EPISODIO_2: mantiene sonando la música del gigante; lasts 3.2 s.
The giant tune (0x91)
Asked for by MONTA_GIGANTE; lasts 5.4 s.
The giant, once (0x96)
Asked for by GIGANTE_SUENA_UNA_VEZ; lasts 4.5 s.
Table track 0x92 (0x92)
Asked for by ninguna llamada directa: está en la tabla de pistas; lasts 2.7 s.
Table track 0x94 (0x94)
Asked for by ninguna llamada directa: está en la tabla de pistas; lasts 4.8 s.
Table track 0x95 (0x95)
Asked for by ninguna llamada directa: está en la tabla de pistas; lasts 4.8 s.
Table track 0x97 (0x97)
Asked for by ninguna llamada directa: está en la tabla de pistas; lasts 4.5 s.
Table track 0x98 (0x98)
Asked for by ninguna llamada directa: está en la tabla de pistas; lasts 4.7 s.