News of the existence of this thing appeared a little early via an advert at the back of the November 2025 edition of Sound on Sound, though apparently only the US/Canada edition of that magazine, not the UK edition.
The official reveal/launch data has clearly not arrived at the time of me writing this post, but Expressive E themselves have started teasing it on their own facebook page:
EDIT : add new promo (says available now - 12/11/25)
cool stuff,
they said from early on, that the keybed was modular so they could do other sizes.
so, a matter, of keeping costs down by having one rather than two models.
guess, now., they can sell to those that needed a larger keybed, and ofc, some will no doubt upgrade - so perhaps some Osmose will start to appear on used market ?!
I wonder, if theyâll take the opportunity to make some other updates?
market this as the Osmose Pro?
not sure, what they could add, perhaps some higher quality encoders?
Cool!
Perhaps they could get rid of these three centimeters on the right of the Osmose and offer a ârightâ and âleftâ version, so you can put them either side by side for 8/9 octaves or stack them vertically organ style?
But a fifth octave is already adding more space (and covers most of the baroque and early classical piano repertoire).
I wish they had offered this from the beginning, when I had more resources to purchase the larger model. Itâs going to be a few years before I can upgrade.
The UK retailer Juno since listed these, a bit early since still not officially announced last time I checked.
https://www.juno.co.uk/products/expressive-e-osmose-61-24-voice-expressive-polyphonic/1121768-01/
Interesting, the bundle with the non B-stock 49 key version is labelled as âas long as stock lastsâ. No idea whether this is about this specific hardware+software bundle or the 49 key Osmose itselfâŚ
I should think this is the âspecial offerâ with software bundler - so just marketing.
I guess, if they have made revisions to 61 key, they might put out an updated 49 key.
but overall, I think odds are 61 key is (almost?) identical to existing version.
unless they have found something that makes manufacturing/support better - so reduce costs. we know they initially had many returns., they appear to sort most of this out in QA and change in process.
but sometimes, you can learn something thatâll help for a new model.
but all speculation, I guess we will find out soon enough.
Iâd expect a swift release, as the cats out of the bag - and thatâll potentially hit 49 keys sales whilst people hold off for the release.
as an aside, Im actually hoping for something a bit differentâŚ
I donât need / want new hardware.
howeverâŚwhat we have not seen yet, is changes in the firmware that are benefitting from the 10.52 update
my HOPE is 61 keys will be launched alongside new firmware that brings âcustom synthsâ with UIs based on overlays !
whilst overlays are useful âas isâ, Im pretty sure a key motivation for them, came from EE - due to it have an onboard display.
I think a new product release, would be an perfect marketing opportunity to provide this updateâŚ
why?
to musicians they can be marketed as different synth âenginesâ with their own UIs that have on board patch editing.
this is huge, as I think, for many users, having limited options for changing patches (and the dread of the EM editor) , was off putting - and different from other synths.
so this change could be used to really ârefreshâ the image / marketing of the Osmose - v. useful when updating your product line.
⌠and, if they have done this firmware update, Id have be tempted to hold it back to sync with a product release 
but again , huge speculation, its a huge taskâŚso Im being careful on my expectations with this one !
I expect the overlay motivation came from expressive e but not because of the screen. It was certainly possible to come up with the idea some years ago, and I seem to remember coming up with an idea or two along the same lines myself. Mostly because from the start there were always going to be people asking expressive e to make the editor better, but the problem with the existing editor is not just down to UI decisions and the technology used to build that editor, but rather the very paradigms at the heart of the synth engine. And expressive e would have figured that out when trying to come up with a solution to these user demands. So using that full on stuff as a synth building toolkit and then building much more straightforward editors for those was probably the most plausible solution, and I was delighted when expressive e confirmed that this was what they would be doing. Likewise I was delighted when Haken did the necessary âoverlaysâ work on their side to enable this to happen.
The area where I would advise more caution with your expectations is the idea that they are going to target the built in screen to provide the UIs for these things at this stage. I dont believe there is presently any evidence that they are going to do that. But I am only going by what Expressive E said near the end of their firmware update 2.1 youtube video from earlier this year:
âspecialized instrument editorsâ
âwith this free 2.1 update, we are laying the groundwork for the next big step to come, which is a new user-friendly way to edit Osmose presets. Instead of the single complex editor, we will be introducing a suite of specialised editors, each designed for specific types of instruments. Electric pianos, analog synths, wind instruments, plucked or mallet sounds, each get their own dedicated interface, unlocking a rich and more intuitive sound design experience. It will be the user-friendly access to harnessing the power of Osmoses expressive sound engine that weâre all waiting for.â
I have always taken that to mean a suite of editors that run on a computer. Of course it is possible to imagine some of those parameters also coming to the screen at some stage, if they chose to go down that route, but I currently have nothing with which to help me guess whether they will ever choose to go down that path. Indeed when I first started sharing my own half-baked ideas along vaguely similar lines some years ago, I probably did it in the context of my own rather fanciful ideas about them selling an additional physical interface that could screw onto the mounting holes on the back of the Osmose, and there is even less to indicate that they would ever entertain that particular idea!
I emailed them about 12 months ago and asked. They said they would be doing a 61 key Osmose but couldnât give a date.
ok, so its here (edited top post to include)
says its available nowâŚ
as expected, it looks identical, just more keys - no mention of any differences.
I am so delighted Expressive E have released the 61 key version. It will save me a lot of money because I was considering buying the Polybrute 12! I have a weekâs wait for it to arrive 
Iâm a bit new to the forum so havenât caught up on all the topics but I wondered if anyone has been using two Osmoses, one above the other like organ manuals? I thought buying two 61âs might be a better option than constantly upgrading as they release increased key versions.
The Sonicstate video shows they are working hard to improve the experience. I should imagine Harken is enjoying the increased user base too so hopefully the development will continue.
I bought the 49 last year, after giving up waiting for a never confirmed 61. Incidentally, I do have it above the PolyBrute12, which is above the HydraSynth Deluxe.
Personally, Iâm not sure if having a double-Osmose keyboard setup is beneficial for my style of playing, since I rarely do expressive playing with both hands simultaneously although it does happen and the 61 should be enough to achieve that.
In fact, Iâm now trying to figure out whatâs the best way to trade my 49 for the 61, since that was always the one I wanted, from the start.
I can imagine there are many 49 key users in a similar position. I havenât played either the Osmose or the PB12. Do they complement each other or are they very different?
Yes great to see some of this stuff visually. Iâve been waffling about this sort of thing for years but a picture speaks a thousand words!
I cant tell you how delighted I am to see this stuff coming true, even though I thought it was a reasonably safe bet years ago because its the only solution that really makes sense to the frequent request to âmake the editor betterâ. No amount of editor UI improvements would get around the complexity of the paradigms at the heart of the engine, so using it as an instrument construction kit and then making nice UIs for those simplified instruments was the only decent solution I could imagine. And once Haken announced they were adding âoverlaysâ functionality, it became clear that this was indeed the path being taken. Hats off to everyone involved with getting all the pieces in place to make this happen.
To clarify, I believe its the sonicstate presentation where a preview of some of the specialised instrument editors stuff is on display.
Youâll get more of a traditional keybed feel with the PB12, along with hands on control of the synth and a nice analog synth experience. And some of the other stuff that synth brings to the table, such as morphing between sounds, pitch ribbon, morphee pad thing or whatever its called.
With Osmose youâll get a very different sort of sound engine, and only some macro & fx & sensitivity & arp tweaking from the hardware controls themselves. But youâll get a lot of factory sound presets where the expressivity of the keys is built into the very heart of each sounds design. The keys wont feel like a traditional keybed as much, but youâll have per-note pitch bending that PB12 lacks, and the greater amount of downwards travel of each key enables a different level of nuance with that dimension of per-note expression too.
If I owned them both I would probably also be able to rave about the joy of using the MPE from the Osmose to control the PolyBrute in MPE mode, but sadly I ran out of money before the PB12 came along (and before they added MPE support to the original PB via a firmware update)
yeah, its nice to see the ideas EE have for the overlays.
What I think is a really good idea, missing from the overlays so far, is a way to âpackageâ them together⌠I donât think many want to have multiple standalone applications (for each editor) installed - so having a âcontainerâ for them seems useful.
also a useful way to package/ update / extend etc.
Im âslightlyâ disappointed to not see them digging a bit deeper into this, and putting some form of these âeditorsâ into the Osmose UI⌠but as above, its a pretty big task - one day perhaps
They have the key travel (vertical key position) in common together with the poly pressure but then they have a lot of differences that make them complement eachother, both sonically and expression-wise.
The PB12 has the immediacy of total hands-on preset making/tweaking on its side, which, eventually, the Osmose may have in the future with a dedicated hardware (or tablet) Overlay based editor controller of one of (hopefully many) âvirtual synthsâ.
