I have an A25 (working) and a MK1 S61 and S88. The transport controls seem to work ok until you hit record. The record button on Studio One stays lit when you hold the record button down, but doesn;t stay lit and no recording happens even if you hold the record button down. I've tried configuring them as detected (don't have a choice since presonus decided to auto-add all my controllers every time I start my daw and I have to remove them every time), and as standalone Mackie Control surfaces. both have the same behaviour. Just want to make sure I'm not losing my mind. I strongly suspect Presonus disabled support for them in some kind of agreement with NI to support the MK2's as this only started happening after the update to add them. Overall I'm getting really tired of both Presonus and NI on the midi front. Seriously. It's been around since the 80's. You think they could figure out how it works by now.