As someone who uses AUM for live keys, I was excited to find a Mellotron app with AUV3 support. However, there’s a very odd bug. In my setup, I load a unique session for each song, but every time I switch to a different session with Manetron in it, the volume of the app drops significantly. Not the volume knob in the app, but the actual total volume produced by the app. The only way to reset it back to its full volume is to completely close AUM and relaunch it, which is not something I want to have to do between every song in our set. So if you have a similar setup to mine, this may not be the app for you.
However, regarding the actual sounds, they’re pretty good. Some of them are a little darker and more mid-heavy than their equivalent sounds in the Omenie apps, which is something to keep in mind if that’s what you’re use to, but they’re still good quality and very usable. I would feel comfortable switching to this as my main Mellotron app if it weren’t for the AUM bug.