The Doppler effect is a real-life sound phenomena that shows up as a frequency change when either you the listener or the source of the audio is moving, its better explained here: Doppler Wiki.
Compatible with Simple Voice Chat and Plasmo Voice.
Config
Default effect "scale" is at 40%, noticeable but not too exaggerated, though I havent tested all means of movement next to audio sources, so you're free to change it in ModMenu's settings screen for the mod or in the config file located at <minecraft>/config/doppler.cfg (value is a decimal with ranges from 0-1 (default: 0.4), though no hard limits).

Why?
I kept seeing insta reels that have "doppler effect" caption with a clip of something in minecraft just decreasing in volume, which is NOT the effect in question!! So I made this mod, so you can hear what it really sounds like, who will use it? idk, but its fun 😸
How to Install Doppler (Mod)
Doppler by imAETHER is verified for Fabric, Forge, Neoforge across Minecraft versions 1.18.2, 1.19.2, 1.20.1, 1.21.1, 1.21.10, 1.21.5, 26.1.2, 26.2 (latest release: 1.2.4, file size: 63 KB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.18.2, 1.19.2, 1.20.1, 1.21.1, 1.21.10, 1.21.5, 26.1.2, 26.2) and platform (Fabric, Forge, Neoforge).
- Make sure you have the compatible loader or environment installed for Fabric, Forge, Neoforge.
- Move the downloaded Doppler file into your Minecraft
.minecraft/modsfolder and launch the game.
All Versions
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- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fix mod affecting music sources
- Fixed getting stuck in the config screen