I got these from @MusicTeck for a 1 day audition (initiated and funded by me). I was so impressed with my Aroma Audio Jewel that I wanted to see what else Aroma had to offer in the form of the Ace, a flagship IEM they originally released in 2018. I listened for about 8 hrs over the course of my 24 hr audition period, mostly in the "Ace" (balanced) setting, with some time in the "Jack" (bass) and “King” (vocal) settings. Credit to @audio123 , his 2018 review was the only English language instruction I could readily find on the switch settings. I...