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When changing the textures, Adobe Photoshop is what you'll need. For sounds, you'll need Audacity. Changing sounds are a hit or miss, but most of the time you'll get lucky. The same goes for textures. There are no alternatives to changing the texture. Adobe Photoshop is the only way to effectively change the game textures. I tried Paint.NET and the texture would look glitchy or wouldn't appear at all.

When putting different sounds into Facade, you would have to:
1. Download a sound of your choice
2. Convert your sound (usually an MP3 file) into a WAV file (https://cloudconvert.com/mp3-to-wav)
3. With that WAV file, open Audacity and drag it in there
4. Export it as WAV and rename it as the name of the file you're trying to change
5. With the exported file, replace the original sound wherever it is placed in the game's files

Note: If you're changing the background music, it's the same procedure, but export it as an MP3. If you're trying to change sounds like the phone ringing, you would have to change the speed of the sound of your choice (set the speed multiplier to 2 and that's it). For Trip and Grace's parents' voice lines, set the speed multiplier to 4.
The process of changing the texture is easy. It's straightforward.
1. Pick an image of your choice
2. Open Adobe Photoshop
3. Drag one of the textures of your choice
4. Save it as a .bmp and just click OK
5. Place your custom texture into the game's files (the textures folder)