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Hello,
I suggest adding the « Require OpenAudioMC » plugin.
This would force the use of OpenAudioMC if the user want.
If added I wouldn't be the only person using it. Knowing that he was not very well known but very useful. I hope that this request will be accepted. 
This article might help you: https://support.aternos.org/hc…mods-plugins-and-modpacks
I've read it before but the plugin is not popular enough. 
Suggestions should have reasonable popularity before they are added to Aternos. If a suggestion was published only a few days ago or only has a few downloads, it won't be added. There's no specific required download count, it's a case by case decision that takes many different factors into account.
Then it can't be added.
