I got the 3-day trial which turns into a $30/year cost. Apparently, I could skip the free trial and give them less money ($25) for lifetime use. I guess it's cheaper for a lifetime because you only realize you're chested after you bought it.
S1S2Controller does less than Apple Music or other apps I have for free or a lot less. Under settings you'd expect an equalizer and other sound & speaker adjustments. Nope you get a link to rate the, a link to a privacy statement, terms of use, and a link to more apps I certainly wouldn't get. There are no settings to be had. I've had S1S2Controller for minutes of surprise, but it will be gone right after saving this review.