OX Stomp Dynamic Speaker Emulator
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Get perfectly miked guitar tones in seconds.
Standing on the shoulders of our award-winning OX Amp Top Box, OX Stomp Dynamic Speaker Emulator pedal gives "amp-in-a-box" modelers a packed pro studio full of authentic-sounding guitar cabinets, mics, room modeling, and studio-quality effects — right at your feet.
Get three-dimensional, album-ready guitar tones from your amp emulator thanks to Dynamic Speaker Modeling
Experience jaw-dropping speaker, cabinet, and room emulations far beyond common IR loaders
Add studio-quality 1176 compression, plate reverb, EQ, modulation, and stereo delay effects for perfectly produced tones
Audition, tweak, and save custom presets and more with the UAFX mobile app
TAKE A LISTEN
Say Goodbye to Static-Sounding IRs
Going far beyond the one-dimensional captures of Impulse Response systems, only UA’s groundbreaking Dynamic Speaker Modeling convincingly emulates speaker breakup, drive, and cone cry — providing harmonics and sonic complexity indistinguishable from a perfectly studio-miked speaker cabinet.
Experience Award-winning Room Emulation
In addition to expertly placed close condenser, dynamic, and ribbon mics on your cabs, OX Stomp is the only effects pedal to offer a complete selection of room mics with Dynamic Room Modeling. This gives you the authentic experience of pushing air while recording your cranked amp in a world-class tracking room.
Enjoy Studio-Quality Effects
Beyond mic and speaker cabinet modeling, OX Stomp also lets you craft stunning guitar sounds with UA effects like genuine 1176 compression, plate reverb, chorus, flange, three delay types, and four-band EQ with high and low-cut filters.
Expand the Tones of any Amp-in-a-Box Modeler
Whether you're using a UAFX amp emulator pedal or other popular amp modelers, multi-effects, or profilers — even your favorite amp's preamp line out — OX Stomp gives you over 100 curated RIG setups, giving you inspiring sounds for any amp type or genre, right out of the box.*
Customize your OX Stomp with a Full-Featured Mobile App
With the UAFX Control app, you can easily swap cabs and mics, fine-tune effects, assign RIG presets, and configure footswitches to instantly toggle sounds and/or effects, for a pro studio's worth of tones on your pedalboard.
Watch Now to get Perfectly Miked Guitar Tones
“Ox Stomp is perfect for getting a good tone with just a couple of pedals. We’ve come a long way from lugging huge amps to sessions to get a great sound!”
– Butch Walker (Fall Out Boy, Panic At The Disco, Pink)
“Ox Stomp is a great tool for practicing on the road! Along with the Lion '68 Super Lead Amp pedal, I get superior sound on the go. ”
– John Notto Dirty Honey
“I really love the Lion and Ox Stomp! They're the only way I can really play my harp through a variety of amp styles outside of a DAW..”
– Emily Hopkins*Note that OX Stomp is designed for instrument and line level only — it's not a speaker load or power attenuator. OX Stomp Dynamic Speaker Emulator requires a modern 400 mA isolated power supply (sold separately). Go here for power supply recommendations.
Product names used herein are trademarks of their respective owners, which are in no way affiliated with Universal Audio Inc. These name(s) are used solely to identify products studied in the creation of the sound models found in OX Stomp Dynamic Speaker Emulator.Customer Reviews
E. Griffith
October 11, 2024
Perfect for amp sims and preamps
I place my OX Stomp after my preamps and amp sim pedals for playing with headphones or recording direct through an audio interface. Quilter Aviator Cub (Tweed/Blonde/Blackface Fender)...
Read MoreM. Lafaurie
September 22, 2024
Top niveau mais il manque un cabs Hiwatt 4x12 purple fane
Mise en route un peu pénible, mise à jour firmeware obligatoire, mais une fois réalisée les simulations et effets sont excellents. Un reproche, il manque une modélisation de cabs...
Read MoreR. Graterol
September 12, 2024
A game changer pedal for my tone
I bought this to expand the versatility of my pedalboard and to improve the tone of my Ruby and this thing surpassed all my expectations. The sounds coming out of this pedal are simply...
Read MoreH. Persson
August 29, 2024
Turn OFF mobile screen lock = ( one) connection issue less
Most have probably already done that - but if someone havent or just bought the product - and wants to minimize one connection issue TURN OFF the Iphone Screen lock when using the App...
Read MoreJ. Egan
July 16, 2024
Great cab pedal.
This pedal sounds awesome, there's a bunch of bad reviews for the app and bluetooth but all of the uafx pedals have those issues, and I agree with the 6 cab slots being a little...
Read MoreJ. McCormick
June 25, 2024
Great tool, but update often
So, the Ox Stomp has been a great addition to my toolbox. I use it with my Friedman IR pedals and with my Friedman amps after running them through the Suhr Reactive Load IR. Neither the...
Read More -
Features
The most authentic sounding speaker, cab, mic, and room tones ever emulated in a stompbox
Authentic speaker modeling including speaker breakup, drive, and cone cry
Over 100 curated RIGs perfect for any amp emulator or genre for endless inspiration
Studio-quality effects including genuine UA 1176 compression, plate reverb, EQ, and stereo delay (dual, crossover, ping-pong) for perfectly produced tones
UAFX Control app for fine-tuning mics, effects, and footswitch configurations
Silent switching, buffered bypass, analog dry through
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Customer Reviews
OX Stomp Dynamic Speaker Emulator
E. Griffith
Perfect for amp sims and preamps
I place my OX Stomp after my preamps and amp sim pedals for playing with headphones or recording direct through an audio interface.
Quilter Aviator Cub (Tweed/Blonde/Blackface Fender) from effects send (line out has it's own cab sim which can't be disabled, and sounds odd combined with the OX speaker cab sims)
Quilter Superblock UK (Vox/Marshall) effects send, or through XLR out, setting it to FRFR mode.
These are solid state amps that sound great in the room, compared to any other solid state amps I've used, but the OX Stomp really adds the magic to their direct signals.
I've also had great success with Joyo American Sound and Joyo AC Tone amp sim pedals, and their cab sims don't seem to cause the same weirdness as that of the Quilters. Combine the crazy ranges of tones in these amps and pedals with the amazing sounding rigs in the OX Stomp and there's a lot of tonal directions to go. I even sold my Line 6 HX Stomp because I found myself playing this way more often.
Oh and I had some app connection issues with the Del-Verb, but not the OX Stomp. I'm using an older iPad Pro. Once I got the 6 rigs set up how I want to compliment my different guitars and preamps (some bright and clear, some fatter, warmer, thicker), I don't need the app very often.M. Lafaurie
Top niveau mais il manque un cabs Hiwatt 4x12 purple fane
Mise en route un peu pénible, mise à jour firmeware obligatoire, mais une fois réalisée les simulations et effets sont excellents. Un reproche, il manque une modélisation de cabs Hiwatt 4x12 purple fane vintage , pourquoi ? A prévoir dans une future mise à jour. Enfin une application desktop connectée USB C serait la bienvenue.
R. Graterol
A game changer pedal for my tone
I bought this to expand the versatility of my pedalboard and to improve the tone of my Ruby and this thing surpassed all my expectations. The sounds coming out of this pedal are simply beautiful. My guitar tone now feels real and more 3D sounding, with depth. The amount of tones in this box is huge.
Regarding the app, I haven't had any issue so far in my 2nd day of ownership (knock on wood) on my iPhone 13 but it seems I'm in the minority here. I'm turning off auto lock and everything is connecting and staying connected as it should. The faders are clunky, it needs numerical values so from a usability perspective there are improvement areas. But overall I'm extremely happy with my purchase, to the point that it's making me reconnect with my instrument and ideas are just flowing to my DAW. Inspiring sounds are the seeds to great ideas and this product is helping me with that. I highly recommend this pedal, It will elevate your tone.H. Persson
Turn OFF mobile screen lock = ( one) connection issue less
Most have probably already done that - but if someone havent or just bought the product - and wants to minimize one connection issue TURN OFF the Iphone Screen lock when using the App via B.T.
And... Please UA - MAKE UA GREAT AGAIN - let the USB be used with a new desktop for App PC / Mac !
Its a great sounding and design with included effects , but, as said ..... MAKE UA GREAT AGAINR. Konz
Waist of Lifetime!
The effect of the UAFX pedals, especially the OX Stomp, is that it enables the perfect frustration tolerance training. Unfortunately, UA has forgotten that many untalented amateur guitarists like me already practice frustration tolerance enough while playing. The Cab Sims are brilliant, but if I spend more time pairing the pedal with the app via Bluetooth than playing the guitar, then UA has frankly missed its target here. Unless they actually designed it as frustration tolerance training under the guise of Cab Sim. Better to choose a different product.
J. Egan
Great cab pedal.
This pedal sounds awesome, there's a bunch of bad reviews for the app and bluetooth but all of the uafx pedals have those issues, and I agree with the 6 cab slots being a little insufficient, hopefully they can reprogram it to where maybe when you hold the preset button it can make the 6 slots more with like an A/B side , then it would at least be 12. Or have the on and preset button have an up or down functionality to it, and definitely a desktop app, there's too many phones with different firmwares to run great on every one, I personally have to touch mine every 10 minutes since I can't turn off sleep mode even in developer options so it can the frustrating. That being said the sound quality is awesome, I have multiple effects processors with different paid impulse responses and as I do like a quite a few of them , they didn't even come close to how many I like with this pedal. The reaction, sound and feel just blew me away, I do wish they would add a noise gate to this and some of their other amp pedals like they did with the lion so you can crank up the gain and go to town, I put 2 gates after the ox for high gain scenarios and it works great.
R. Spaulding
Great tones, horrible app and horrible customer support
What is the point of this gear if you cannot get support for it? The primary app required to adjust essential parameters does not work. Non-existent support. Returned. Frustrated.
B. Love
Frustrating
Great sound and possibilities. Here is the problem, you have 6 rigs/preset spots. Great if you like those 6. In the app however there are a bunch of really great presets and also a lot of tweaks, eq, mics cabs, awesome.... Except the app never works!!! You get it to connect after several attempts, device goes to sleep while demoing your changes, you guessed it, you have been disconnected and have to try and connect to the pedal again. Finally get it to connect again and go to make some eq changes, it just disconnects while accessing the page. I am by no means a UA hater, I have most of their plugs and have tried all of their big pedals. Same issues amongst all of them and have had multiple devices. UA seems to not think the problem exists or maybe they cant fix it. Bottom line buy them if you are happy with the default settings otherwise prepare yourself for frustration. Now i have to decide if I keep losing time and creativity or return it. Sold all of my other UA pedals for the same reason by the way . Had some hope that they addressed the issue....no they didn't.
P. Pauliks
Great sound with a fiddly app
The sounds are usable and of very good quality!
BUT; the fiddling about with the app is an intolerable imposition. Why the hell isn't a desktop app offered here so that you can work with it properly in the studio?
But you probably have to give OX Amp owners another reason to buy it ... ??
Please, finally offer a desktop app !!!
J. McCormick
Great tool, but update often
So, the Ox Stomp has been a great addition to my toolbox. I use it with my Friedman IR pedals and with my Friedman amps after running them through the Suhr Reactive Load IR. Neither the Friedman pedals or the Suhr sound bad, but they don’t react like a real speaker and compress and change character a bit as you adjust your playing. That’s where speaker emulation comes in and takes over where IRs leave off. That’s why you can’t upload your own. The cabinets in the Stomp are not IRs—they’re an emulation of how a speaker actually acts, not a linear representation of the speaker in a particular setting like an IR. Add in all the studio tools of EQ, compressors, yada, yada and you’ve got a huge amount of power in a compact pedal.
And that’s where the rub starts. You have to use the app to get the pedal setup and delve into these features. That’s fine—the app is great for this. The problems come in with connectivity issues and slow pairing with the pedal. You can only connect to the pedal wirelessly and if your phone or tablet locks, the connection drops and takes a bit to reestablish. It’s gotten better with updates to the pedal and app, but still can be frustrating. For me, though, I got my setup and don’t fidget with it too much, so this is a minor issue, but worth the warning.
Overall, a great pedal and a great investment. Solved my complaints about IRs and did so very well.J. Bacon
Utterly beautiful sounds, DESKTOP APP PLEASE !
Having tried many guitar plugins for recording over recent years - some of which are excellent, all told - I still missed the dimension of using a physical amp. But I didn't want to go back to mic'ing loud, heavy tube amps, let alone buying them.
With a Friedman IR-X I got a long way towards a studio solution. (I dare say the UA amp pedals are great too, but haven't tried them yet.)
There are some decent third party IRs out there; they get you the colours you are looking for, but they can't - and don't - react like a speaker in real time. They are kind of 2-dimensional renders.
Along comes the next solution: OX Stomp. And sonically it does not disappoint! This thing gives that sense of space; of things being reactive, complex, delicious.
There are a sensible number of great-sounding cabs and mics included in the package - enough to excite, but not so many as to overwhelm. The room sound feature is cool. The post-effects are great, especially the reverb.
For this aspect of the pedal, it's a solid 5 stars.
Then we must mention the app.
I can only echo what everyone else is saying: it is a pain. Once you are connected, and if you can stay connected, it works ok. But smart phones are not the smart format for this. They would be ok as a "bonus" but, not as the mainstay editor.
In fairness, I managed to get the app to work for me - eventually. And for me, it doesn't matter too much now, because I have set up 6 rigs which all just work, and I am a set-and-forget person.
But if you are someone who likes to tweak, and needs to edit regularly, you are probably going to be as frustrated as many of the other reviewers here.
So - UA - with great respect, please could you prioritise turning this excellent pedal into the *masterpiece* it should be, by giving us a desktop app with a solid USB connection? I can't imagine it would hurt sales; nor should this be difficult for a company of your seniority and talent.
M. Becker
Awesome device, great sound, app is almost unusable
The Ox Stomp is just amazing. It sounds exactly like what I'm used to hearing from miked up speakers. The range of cabinets, microphones, and room mic options covers almost every sound combination you could think of. I'd love to see a Mesa Oversized box with Celestion V30 and an effects box from Pignose added, but that's just a nice-to-have, not a necessity.
I used to be a Two Notes Torpedo user and now I'm absolutely thrilled with the OX Stomp hardware box. However, the app is a disaster. It's impossible to quickly do anything since you always have to grab the tablet next to the computer, hold it with one hand, and operate it with the other, which completely disrupts the flow. With the Two Notes computer app, I can do everything with just two mouse clicks. Even taking your right hand off the guitar, click, click, and you've got a different sound. That's usability.
Additionally, the app constantly needs to be reconnected to the Ox Stomp via Bluetooth since the connection drops out regularly.
I love the OX Box, but if it were connected with a stable desktop app via USB, I'd love it even more. Then it would be perfect.A. Mtz
VERY UNCOMFORTABLE APP
sorry to say — as many reviews before— i don’t know who told you that having the app in the cell for hardware like this one could be a brilliant idea ?
it’s annoying !
C. Jäger
Sound 10 - App 0
Love the tones but editing is a drag. Give us a desktop app with better usability and adjustability. Can’t be that hard for a company like yours? Just get it done soon!
D. TILLOT
I beg you, create a desktop application
It sounds good, but like all the other reviews, it's an unfinished product...
M. Terracol
Very disapointed by the sound. The bluetooth app is a mess.
Regarding the sound, I found it OK, but far from being extraordinary as the commercial videos claimed. After two weeks of testing and tweaking, I much prefer my old Torpedo CAB M, which sounds more lively and natural with a wider choice of speakers. Regarding the additional features, the delay is ok, I didn't like the reverb and the compressor seems unusable. The “room microphones” feature is interesting, but it quickly sounds artificial to my ears.
The biggest mess is the MANDATORY Bluetooth app. UA simply should not sell this product. It is almost impossible to connect the app to the pedal. The only way is to "forget device completely" in your phone settings every time you want to change something on the pedal. This is unacceptable!
In conclusion, I found this to be a very expensive and unfinished product. I returned it for a refund, with no regrets.A. Cooper
Outstanding....and no problem with the App
The quality of the sounds that come out of this pedal are amazing. Its almost too good as there are so many factory presets and the majority of them sound superb with my Dream and Woodrow. I suggest finding a handful of presets you like and then sticking with them. Its very easy to tweak the sounds to taste anyway. I had some apprehension buying the OX Stomp as almost every review I've read, including nearly all of the reviews here, noted how awful the App was. It seems that mobile screen lock seems to be at least partly to blame for the connectivity issues so I adjusted my mobile settings before staring the UAFX Control App to prevent screen lock. I've been controlling the OX Stomp with the app now for a couple of days and I haven't encountered any connectivity issues yet...touch wood. I've got the latest version of UAFX Control installed on my phone which is running on Android 14, in case that helps anyone.
t. fuji
アプリが終わってる
アプリも反応しない。パソコンにも反応しないやつがある。使えねえな。
M. White
Great product - Crappy App
Out of the box, the OX Stomp is a 5 star product. The ONLY downside is the app. On both, my Android phone and IPad, the app started about 25% of the time. I bought a new IPad Air, it works 100% of the time. The logic is still too laggy to enjoy. Fix the lag and bluetooth reliability, it's a 5 star experience all day, every day.
a. constantin
Issues with the app
I love the way it sounds, but it don't work with Android system... Can you design a computer application please ?
