My sister made a drumloop (let's give some feedback) 

Well done! We wanna hear more ;D

That’s awesome Tessa and #@underdog team

Yep, lots of knowledge acquired of many years, I'm sure.

Mastering is basically doing similar moves to mixing, but in a much subtler way, as the effects used apply on the entire song (IE the mix). A good mastering engineer will slightly help reduce the resonances in the track, make it louder, rebalance the frequency response of the track, so it both translates better to other devices and sounds closer to tracks of similar styles, further control the dynamic range (both to help the track pump and to make it easier to make louder), and, finally, do minor creative tweaks such as adding saturation or expanding the stereo image, to make the song's qualities more apparent. So tldr: mastering is principally making the song louder, but it's also making small but sweeping changes to both have a track that better translates into other sound systems, and that just overall sounds intersubjectively "better" (while there is no objective "better" in music, we do have arbitrary standards that we generally agree makes music "better").

They are probably Adam S3V

I think he mentioned them in his studio tour video from a little while back

The magic is definitly in the mix, not the Master. My advise: don’t waste your Money on a mastering for something that isnt mixed properly. Mastering is only trying to make Tracks translate more even on different Sound systems, and maybe Adding a little Bit of grit or loudness. But an unmastered track should still Transport the mood or energy of the track.

@Dispoboy1 Thanks for your reply. Was never considering paying for anything to be mastered, would want to learn it myself. But I've been waiting until I made something which I felt was worthy, which I haven't done yet. The stuff I'm trying to make has a heavily-produced sound, i.e., not subtle with the effects, lots of distortion, with more emphasis on texture than melody. But it just feels like something impactful is missing from my sounds.

@@thegrinderman1090 try parallel Processing and keeping the Level under -12 DB. I had that when i was mixing too loud. Good luck 🫡

@@Dispoboy1 Interesting. I'll give that a try. Thanks for your help!