This is a sub-page of Undertale.
Unused Music#
mus_smile#
A very distorted sound that only plays in room_gaster (room 264), which is never reached in normal gameplay. It happens to be a modified version of Muffet's laugh that is also reversed and looped later on.1 The audio does later get used in Deltarune on two occasions: attempting to use the Cell Phone in the Dark World plays the first six seconds, while the full audio, slowed down by 666%, is used for the ambient hum outside the shelter in Hometown.
mus_kingdescription#
A more orchestrated rendition of "Determination", the Game Over theme. Based on the filename, it was most likely used in a scene related to Asgore.
mus_dance_of_dog#
This funky fresh beat plays exclusively in the "dancing" dog error room. The error room is most easily accessed by messing with your save file.
Interestingly enough, this song would later be officially released as part of the [https://www.fangamer.com/products/deltarune-chapter-2-vinyl-soundtrack?srsltid=AfmBOoqdofHoGeTp3E-4ih8T-t--epoCX3DHDmfjO_dzjEZvuNNwFy0D| Deltarune Chapter 2 vinyl soundtrack], despite not being in the files of any chapters of Deltarune to date.
mus_sigh_of_dog#
This unfunky fresh beat plays exclusively in the sleeping error dog room. The error room is most easily accessed by messing with your save file.
mus_star#
Music that uses instruments from Star Fox. Other tracks in the game use instruments from games like Mario Paint, Final Fantasy VI, Chrono Trigger, Mega Man X , and EarthBound, so this wouldn't be TOO out of place.
According to Toby Fox, this song was intended to play when Madjick's magic orbs turn into healing hearts. However, this proved too difficult to implement because the Core's background music continues into monster battles, so it was scrapped.
(Source: Toby Fox)
mus_f_part3#
Another variation of Flowey's boss music. 0:20 onwards is used for scene transitions, however, internally, a sound effect that sounds like that part plays instead of this track.
mus_f_finale_1#
An unused first part of "Finale". This track is never played, as mus_f_finale_1_l plays instead. It is simply a shorter version of the first part of Finale, and it is most likely the game would have restarted at the point where the souls heal you instead of immediately starting on the fight.
mus_piano#
Played at the end of the Undertale demo after clearing a neutral run, and appears as the last track of the soundtrack (titled "Good Night"), but isn't used in the final game.
mus_ruinspiano#
A slow, solemn piano rendition of the music played in the Ruins. It is a slowed down version of the first section of "An Ending".
mus_birdsong's Hidden Loop#
Bird That Carries You Over A Disproportionately Small Gap (mus_birdsong) is played when the bird carries you over the gap in Waterfall. However, the music only lasts one loop until it fades out. The file DOES loop properly, however a bit of the music at the end gets cut off in normal gameplay.
Unused Sounds#
snd_hurtsmall#
A small voice getting hurt. Would be brought to Deltarune, and would still be unused there.
mus_sfx_a_swipe#
A voice (presumably Asriel, based on the filename) grunting.
mus_sfx_ahh#
Flowey says "ahh".
mus_sfx_voice_triple#
Flowey says "triple".
mus_silence#
Audio file that's, obviously, silence.
snd_curtgunshot#
A generic gunshot sound.
mus_f_wind1#
An unused longer loop of mus_f_wind2.
mus_f_newlaugh_low#
An unused lower pitch variant of mus_f_newlaugh.
mus_woofenstein#
An unused longer loop of mus_woofenstein_loop.
Removed Sounds#
obj_rainbowbolt_realgen references a sound with the file path music/sfx/sfx_menu_error.ogg, which doesn't exist and is never played by the object anyway.
(Source: Original TCRF research)