I would like to explain how I am using loopers at the moment. I use a mute track and use only overdubbing. Kinda like you described. I do know the length of the recordings I want to do. But I want them to start immediately.
I had a live show yesterday with the AEROS looper and I would like to share my feedback as I will not be using it unfortunately. The positive side is that the looper is a very small device, good ideas went in the design. The support is one of the best I have ever seen. Really good! The downside after my experience: I cannot do a proper track with it. It is always noticeable where the loop starts and ends using the overdub. I was trying hard to make it work, but couldn’t. I could do absolutely perfect loop tailoring in Ableton and in my live loopers (3 Digitech Jamman Stereo). Live I jam and when I feel I have a nice groove, I record it. But this means that I cannot stop playing when the recording of the loop starts, and it should end in a way that sounds like I have continued playing. This is not achievable with AEROS.
The second problem is I had to realise that I need all my tracks accessible with one click: Record, Undo (or mute) and clear. This means I need for the 6 tracks 18 buttons. The track selection system (selecting a track that I deal with) is not good, because it is way too much jumping around. When you need to play and act on stage because you are performing, you don’t have the time to look at the looper but for max 1 second to see where to step. I’m using 3 tracks now, this is 3x3=9 buttons I’m using. And also you need to be able to mute more than one track at once, which with a sequential selection is not possible. So I need a midi controller with 18 buttons for the 6 tracks, which would be way too big. I was thinking using only 3 or 4 tracks and get a midi controller, which is again hard because they send CC messages with values of 127 (?) but AEROS have a special mapping that only one or two midi controllers can stand up to. Your AEROS+MIDI controller is about €1k, which makes it quite expensive btw.
So the second issue here is you have to do way too much stepping around, which you don’t have time on a performance. With AEROS I spent most of the time looking at the device instead of looking at the audience.
The third issue is because of the much stepping around I did mistakes, which with my setup meant that the channel is clogged, I cannot use it any more because I can only undo or a mute. This ate up my channels. I’m not separating songs, I have to have music played all the time.
Sorry for the long email, but I hope I could help. I will send the AEROS back to Thomann, but hopefully revisit the situation in a year, I might try it again then with your improvements, because as I said the product support and design is very top notch.
My suggestions: Fix the issue of being able to record a track without being able to notice the beginning. Just play a sine wave and until you can not record it without noticing the beginning and the end, you are not done. Better / flexible MIDI implementation. It is somehow puts out a low fq noise, around 100Hz. Maybe just mine(?). Do balanced outs, this is essential for pro applications. Make the user able to use as many tracks / parts as they set up (6 max is enough), and make it able to upload a backing track. Locking tracks are a good idea.
Keep doing what you do and you will have the best looper!