A note on the original question of whether you can do things without a screen in case that’s a big concern impacting the purchase decision. Or for anyone else reading, thinking the same thing.
I’ve only had my OP-Z for a few weeks so still definitely learning (I have an OP-1 so it’s not ALL totally abstract but it’s still a steep curve), and I have to say, I’ve found NOT connecting to a screen a far better and far more rewarding way to learn.
With the screen, you can’t help but rely on the visual input. That sounds obvious I know, but as in, you don’t develop any muscle memory other than navigating to each function page (master, tape, tracks etc). Once there, you naturally do/watch everything through the screen.
I quickly realised I was becoming too reliant on it and unable to remember where things were on each page without it. It’s an incredibly complex, well designed navigation system once you get your head around it. But with a screen, you only really need to operate at the very top, never drilling down into the secondary pages.
One of the reasons I got it in the first place, as with the OP-1, was its tiny, self contained form factor (I literally have no other music production equipment other than some real instruments), and suddenly HAVING to have an iPhone or iPad was breaking that minimalist dream.
So i turned it off and have not used the screen again, to force myself to work solely from the leds - their colour, the brightness, their movement etc. It was actually surprisingly fast to get to grips with and ultimately gives far more ‘feel’ to using the device than reading the information.
You learn to listen to the sound rather than ‘look’ at it. Is the delay at exactly 25% and the reverb at exactly 75% like you wanted? No idea, but it sounds good so it’s working!
Removing the screen removes most of the precision that comes with computerised music production, or that you could achieve with a DAW. You can easily quantise, step sequence etc and often see when things are at dead on 0%, 50%, 100%, but other than that, it’s all about the feels! It turns it into far more of an instrument you PLAY, than some software that you USE.
So if the lack of screen is a deciding factor, I’d say go for it, it’s a LOT of fun to navigate almost entirely with your ears and if it proves unsatisfactory, you can always turn the phone on - it’s still a pretty minimal setup after all!
Hope this is helpful insight to you or anyone else facing the same conundrum. Good luck and have fun!