Alive and Kicking suggestions
Here are three suggestions based on a video from "Dot Operator" showcasing his work on the mod's music and sounds. Of course, these should be added with permission from the mod's creators.
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The Clean version of the Unstationary Scaffold should be changed to this version from Alive and Kicking.
(Top view)

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Add HEP Music, which should be added automatically via the compiler, like Laser Music.
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Add music from the mod once it releases. In my opinion, the music is very pleasant!
Here is the video I'm referring to: https://www.youtube.com/watch?v=U9nmN-3sfjU
It looks good!
Alive and Kicking hasn't been released yet, so we don't currently have access to these assets. Additionally I'm pretty sure HEP music requires source code access (which they would have gotten).
Yeah, it hasn't released yet, but once it does and you get the permission, you should add these. I'm sure there can be some kind of hacky workaround for HEP music, like an extra entity attached to the pellet if HEP music is enabled.
It might be possible to replace the pellet's idle sound (which we already have to pack in) with music. The main problem then is that we don't have any music to use for it.
Well, HEP music is in Alive and Kicking. We'll probably get music to use from that once it releases.
Here's an extra idea for HEP music: If possible, there should be an Itemvar to make Infinite Pellets emit lower-pitched versions of the regular HEP music.
Add music from the mod once it releases. In my opinion, the music is very pleasant! I found it i think: https://youtu.be/5yzLxq9vek0
If the HEP music gets added, it should have an option to change it in the Style Options window, and there should be a "none" option in which case it'll play the P1 or default sounds.