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This setup had me check if centrifuge sounds somehow got removed. It seems idle machines count towards max_sounds_per_type.

What I expected was working sounds playing with priority over idle and idle not counting if there is no idle_sound as with centrifuges.

Can you post a save file showing that issue? From what I'm seeing in the sound logic that shouldn't happen (it was one of the things I thought I fixed before 0.18.0 was released).

Certainly, that effect is very easy to replicate.
I just had to rebuild the same 4 centrifuge setup as in my heavily modded megabase.

Can confirm still occuring on Vanilla 0.18.18 game, built 6 steam engines and only end two were hooked up and operating, from one side to the other (end next to the 4 non operational engines and sound would just stop at one point. completely reproducible if save is desired

I know what causes this but I have no solution.

After more time; there is no solution to this (that I can find). Idle machines also produce a sound (the idle sound) and so they can't just be culled from the count when using max sounds. Simplly: max working sounds doesn't work for any entity that turns on/off like assembling machines.

This has been fixed for next release.