The new manual mining and assembling machine sound effects introduced in 0.18 are beyond god-awful. I don't see people making patches to revert these sound effects, so I made one myself.

Sound effects reverted to pre-0.18:
Base game - assembling machines, manual mining, inserters, & transport belts.
(optional) Bob - assembling machines, inserters, & transport belts.

Customizable sound effects:
[Base game & (optional) Bob]
- Laser turrets (0.18, pre-0.18, new type 1 to 4: low humming, high-power, laser drill, & eye laser )
-Train and wagon sounds (0.18, pre-0.18, steam engine), courtesy of https://mods.factorio.com/mod/OldTrainSounds

In mod settings, you can choose which sound effects you want reverted and which to be left alone. I added some optional new sound effects to laser turrets, which can also be selected in settings.

If you want any other sound reverted, let me know.

Old But Better Graphics:
https://mods.factorio.com/mod/OBBG