That’s an OSX app for cleverly getting samples into the AR instead of merely sending them by sysex. Elektron will be enhancing their offering of direct sample management in a month or so, so we’ll soon see how much that makes the task quicker. Jakob’s other app is called Strom, that is without peer - so maybe that’s the one you were thinking of
It’s good to have more Max users around and fretless guitar too … given your brief CV above, I wouldn’t be surprised if you had known a now sadly passed and great artist called U. Srinivas … one of the most sublimely gifted string artists I’ve ever heard … but I grew up as a teenager listening a lot to stuff like Shakti w John McLaughlin … I can totally see how the AR will fit into your setup
welcome to the forums
edit: link for others