Maybe I will try the tracker mini but same as the op-z, probably polyend is working on an updated version 
If it costed less i would have already bought it: M8 didnāt fit me but the polyend tracker OG got me going fast as fuck, the buttons and the jog wheel are amazing and super useful, same for the small pads.
as of now and with all the other comments OP-Z seems the most likely
Ableton Note, Grooverider GR 16, BAM.
Iād definitely wait a week to see what comes up at Superbooth. Wouldnāt be suprised if thereās something new or updated that fits the bill.
The Roland S-1. It has a 64 step sequencer. Thatās like most Elektrons.
MIDI in/out. Sync in/out. USB-C with a built-in battery. Actually pocketable, and more rugged than a Pocket Operator.
I admire people who can work out tunes on the go. Iāve taken kit on trains and buses and get too distracted, or feel under the pressure of time. Iāve enjoyed having an Elektron box with me when staying away, so that seems like an obvious choice.
Perhaps the Roland mc101 is worth a look? Battery powered, powerful, compact, four tracks, bread and butter sounds with the hell of menu diving if you want to suffer for your art
I mean just because they āmightā release a new OP-Z, doesnāt mean youād need to sell the OG one in the event they did. Itās still a really solid device with tons of versatility and would totally suite what youāre looking for.
Ableton note, koala or drambo on iPhone. Tough to beat those. If you must have hardware, dirtywave m8.
I never understand why the Roland MC101 isnāt mentioned more in these kinds of threads?
I like to carry the OG Op-1 , but my friend swears by the Deluge and it does look like a lot of fun.
a used model cycles!
Another two votes for OP-Z and Ableton Note
Though I agree on waiting on the Z until atleast superbooth. A refreshed OP-Z would be an instant buy for me
I also really really enjoyed the M8 and want to buy the 2.0.
I made tons of music with it and its ability to store endless projects was super nice.
I didnāt enjoy the short battery life of the 1.0 version, and ultimately I felt like I wanted some hands on control / playability so I stuck with the OP-1F but I do miss the M8, itās very usable on the go (even more so than the OP-Z or OP-1F)
Iām with @ki_cz3d, the Roland MC-101, small, portable, battery powered, sequencer, samples and enough synth sound to last you half a lifetime. You can play on the keys or program in your ideas; drums, bass, pads, leads, arpsā¦itās literally all in that box if you like the sound it makes. When youāre done save the stems to your DAW or perform from the 101.
unfortunately i had a bad quality issue with mine, so I am afraid of buying another one + it is expensive. if someday theyāll start going for 500 Iād buy one for sure.
Iād say it was the most inspiring peace of gear Iāve ever had even tho after some time it started feeling limited in terms of sound palette.
definetely super portable and perfect for scathing, but quite scared of spending 650+ for something that may start working badly after a couple of months
I just sold the m8, even after all the features it had: if I am going around I am just sketching things out quickly and having fun. Its workflow didnāt workout for me, it was more of something to use at home really focused
No internal battery and I did not enjoy it at all. Some people use that even to make ambient, tho. Thanks anyways 
AFAIK it requires a lot of menu diving, making less competitive torwards op-z or circuit tracks
OP1F the price of an M8 would be a dream
actually I find traveling really inspiring, but you need to have time to put down whatever comes to your mind. thatās why I am in search of something quick and easy rather than M8 (super powerful and portable but slower than dropping a couple chords on the op1 cassette recorder, imo)