Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Role swap list:
• Frisk - Chara
• Ragel - Flowey
• Toriel - Asgore
• Dummy - Mad Dummy
• Napstablook - Mettaton
• Sans - Papyrus
• Annoying Dog/Toby - Temmie
• Nice Cream Guy - Muffet
• Glyde - So Sorry
• Snowdin Shopkeeper & Innkeeper - Hand Receptionist & Diamond Receptionist
• Grillby - Burgerpants
• Monster Kid - Asriel
• Undyne - Alphys
• Gerson - Gaster
• Riverperson - Father Alvin
• 01 & 02 - Dogamy & Dogaressa
• Catty & Bratty - The Warrior & Purple Guy
• Patience - Justice
• Bravery - Kindness
• Integrity - Perseverance
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Area swap list:
• Ruins/New Home - Waterfall
• Snowdin Forest - Hotland
• Snowdin Town - MTT Resort
• True Lab - CORE

Water Under the Bridge OST Playlist

Water Under the Bridge OST Playlist - The Sanctuary (Ruins)

Name the fallen human
"FRISK".
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Ruins
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Yep, Frisk is still the first fallen human here! You play as Chara. On the other hand, "Determination" swaps with "Hope". Which means, "Hope" is the core trait of every human being. Chara benefits a lot of hope and possesses the soul of "Courage".

☂ An Empty Stream of Progress ☂

*It's a pile of blue glowing mushrooms.
*They must've softened your swift impact.
*Nowhere to go but forward.
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- None
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Yep, this is the "wind" replacement. Additionally, Waterfall swaps with the Ruins, more specifically, the Garbage Dump swaps with the Starting Point and the mushrooms swap with the golden flowers. If you fall onto them, you'll find yourself in a beautiful and serene atmosphere of the sanctuary... well not when you're in the start of it since there'd be garbage all over the place. And just as importantly, have "faith" in yourself to the end!

☂ Waking up in the Garbage Dump ☂

RAGEL:
"Mushroom dance"
"Mushroom dance"
"Mushroom dance"
"Whatever could it mean"

"It means you are ridden with a spiritual purpose."
"An unbridled motivation to seek what you long to see."
"Born out of a dream, grown to rebel within you."
"You are blessed with a quest to brave into our world."

CHARA:
"A dancing mushroom...?
"How interesting."
"So you are aware of what I came here for."

RAGEL:
"Oh CHARA..."
"My little dance never fails to delight me."
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Mushroom Dance
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Ragel swaps with Flowey. Since waterfall is usually filled with mushrooms, if not just crystals, this grooving mushroom gets to play a much more prominent role. And just as importantly, have "faith" in yourself to the end!

☂ Mushroom Dance ☂

Art by @the_freaking_weirdo

*Welcome to the SANCTUARY, young one.
*The archeological remains of the subterranean.
*Prior to being flooded, many used to dwell in these ancient relics. 
*However, today I am going to welcome you...
*...to your "New Home".
*Err... you may wallow in its unusual atmosphere.
*Though I hope it will not get you... soaked to the skin, hohoho.

*The water rushing down from the unknown fills you with HOPE.
*Go ring your first bell!
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Once Upon a Time
- Start Menu
- Undertale
- Memory/His Theme
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As stated in the previous track, the reset bell from waterfall swaps with the save point. If you somehow die, you'll be brought back into where you ring your last bell! Related to the sanctuary, the little mouse from everywhere swaps with the spiders from the bake sale location. If you like cheese, consider buying them for only 7S! And just as importantly, have "faith" in yourself to the end!

☂ Bad Weather for a Stroll ☂

The control setting with extra tem
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Ball Chime/Mystery
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Temmie Chang swaps with the annoying dog himself, Toby Fox!

☂ Ah... Maytime Joy 🌻 ☂

*Ah... that troublemaker is always so persistent.
*My deepest apology for not arriving sooner...
*Nonetheless, perhaps an introduction is a must.
*Howdy, my name is ASGORE DREEMURR.
*The honorable baron of the waterlogged SANCTUARY.
*Do not worry, young one.
*I am not going hurt you.
*But instead, I am going to protect you from any imminent danger.
*Please, enter through this water barrier.
*For we must gather way forthwith.
*There is so much for you to familiarize yourself with.

*It has been quite a long time since a human has fallen down into the subterranean.
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Small Shock
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Asgore swaps with Toriel, definitively. Instead of wielding 'fire magic', he and Toriel wield water crystal magic! Asgore is an old farmer living in a flowering ranch with a hobby for playing guitar. The reset bell from waterfall swaps with the save point, and is now white/silver-colored. And just as importantly, have "faith" in yourself to the end!
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Wow, an update! (I've been waiting for this to be uploaded lol) But anyway, I decided to use genesis instrumentation since SEGA and Nintendo swap in this one. Don't worry, if you like the old one better. I still have it uploaded, just not marked as official anymore.

☂ Old but Gold ☂

*Long since, two races reigned over the EARTH: HUMANS and MONSTERS.
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Ruins(/Battle Against a True Hero)
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Since it's related to the intro, the barrier swaps with the gate entrance from the Ruins, and Mt. Ebott swaps with Mt. Emmett (which is actually real mountain if you search it up =P)Like Toby's old plan, Chara's going to seek for a refugee from a heavy rain outside, which explains why it'll be raining in the sanctuary. Chara will be donning a cute green raincoat and bring an umbrella as a... weapon.
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Third update! Remember the very first version of "Left in Ruins"? Yeah, this is a combination of the two which additionally uses genesis soundfont to stay consistent with the technical SEGA and Nintendo swap.

☂ Left in Ruins ☂

*oh my, please look away!
*i am not worth gazing upon!
*i am the ugliest creature, resembling the beast itself, that nobody loves!
*how embarrassing, i feel utterly ashamed of myself for being seen like this!
*...
*well, well, well.
*well, well, welly, well, well.
*i could've possessed this dashing body earlier.
*how embarassing!
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Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
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Leitmotif:
- Grandpatemi
- Metal Crusher
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Mettaton swaps with Napstablook, definitively. The first leitmotif is specifically the 'grandpatemi' version of Metal Crusher. Knowing that Temmie would be the creator here, the short melody becomes the intro to all of the midboss! On top of that, I tried for a more chiptune approach which I thought would sound very nice to listen to.
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This update is meant to combine the oldest version of "Phantasmal Paramour" with the Metal Crusher-sounding update, along with a bit of genesis instrumentation sprinkled around the song.

☂ Encountering With a Phantasmal Paramour ☂

A song to open a whole new chapter. An adventure has begun!
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Undertale and Deltarune was created by Toby Fox
In an alternate universe, Underswap and Warpedsun were created by Temmie Chang
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Leitmotif:
- An Ending/Ruins
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So I suppose this is basically the first introduction to WARPEDSUN, the deltarune replacement of the swap universe that I made. "Before the Story" plays for both games. And before we actually begin to posting WS tracks, WS is a team's AU (just like how Toby Fox made his own team for deltarune), meaning I won't be the only person to work on it. "What about PROSEMOOR?" Don't worry, I have a few songs done for PROSEMOOR and will continue uploading again later. On the other hand, WS swaps dark world with other dark world instead of just swapping characters all over again.

☂ A Beginning ☂

* Mushroom dance
* Mushroom dance
* Mushroom dance
* Whatever could it mean

* It means you have some loose ends to tie up.

Undertale was created by Toby Fox
Underswap belongs to the community
However, somewhere in an alternate universe... Temmie was the creator of Underswap

In all seriousness, this is my take on Underswap.
You can call it Temmieswap, Moonswap, "underswap", or even lowercaseswap (thanks to Slick Silver)

Beforehand, this is in no way related to "Legend Behind the Chasm". That AU stays as an ambitious "Underswap-inspired" AU project with a particular Temmie's aesthetic. This is all the more the fun little reboot of my old "Temmieswap" official soundtracks. While this garners some of the canon/classicswap aspects, I've decided to add a little bit more of creativity and spice some things up, but not to point where it goes "very original" which is not what I'm aiming for. Roles might change in the future, but for now, it's still a heavily work in progress. And final note, I'll only swap "Undertale" motif with another "Undertale" motif. So there's no other Toby motifs, let alone Temmie's

Role swap list:
• Frisk - Chara
• Ragel - Flowey
• Toriel - Asgore
• Dummy - Mad Dummy
• Napstablook - Mettaton
• Sans - Papyrus
• Annoying Dog/Toby - Temmie
• Nice Cream Guy - Muffet
• Glyde - So Sorry
• Snowdin Shopkeeper & Innkeeper - Hand Receptionist & Diamond Receptionist
• Grillby - Burgerpants
• Monster Kid - Asriel
• Undyne - Alphys
• Gerson - Gaster
• Riverperson - Father Alvin
• 01 & 02 - Dogamy & Dogaressa
• Catty & Bratty - The Warrior & Purple Guy
• Patience - Bravery
• Integrity - Perseverance
• Kindness - Justice

Area swap list:
• Ruins/New Home - Waterfall
• Snowdin Forest - Hotland
• Snowdin Town - MTT Resort
• True Lab - CORE