Boss RT-20 Rotary Ensemble
Boss RT-20 Rotary Ensemble

RT-20 Rotary Ensemble, Rotary speaker simulator from Boss in the Twin Pedals series.

All user reviews for the Boss RT-20 Rotary Ensemble

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Average Score:4.7( 4.7/5 based on 6 reviews )
 4 reviews67 %
 2 reviews33 %
Audience: Advanced users Value For Money : Excellent
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moosers's review

Boss RT-20 Rotary Ensemble
The Boss RT-20 Rotary Ensemble is a digital guitar effects pedal that emulates a rotary effect. It has 1/4 inch inputs and outputs and is powered by the power supply that comes with it. It is not a rackable unit as it is a guitar stomp box.


The general configuration of the pedal is pretty simple, but takes a little time to get used to it as there are a lot of different parameters to control different things. The knobs it has includes one to choose between four different modes, one for effect level, one for direct signal level, one for rise time, one to balance between the bass and horn level, which is kind of like tone, one for overdrive, and one each to control either slow or fast, referring to the speed. The manual is complete and helpful when learning this pedal.


The sound quality of the Boss RT-20 is pretty awesome. It basically emulates all types of rotary sounds like a sound from a leslie speaker or a chorus like sound. I have only used this with guitar, as that is what I play, but it would definitely work well with other electronic instruments like an electric piano, or even an organ that needs a leslie simulator. The overall sound is rich and full and the variety of effects is pretty outstanding. The many different modes and parameters allows for this to be a pretty versatile pedal.


I've been using the Boss RT-20 Rotary Ensemble for about a year and I have found it to be a great tool when looking for rotary type effects. It is built extremely well, and has the Boss seal that I have come to trust. Once you learn what everything does on this pedal, the possibilities are pretty much endless. While it isn't the cheapest Boss pedal, it is reasonable considering how much you are getting with this pedal. It probably isn't as good as the Hughes & Ketner Rotosphere, but it will cost you less and probably has a wider array of tones. All in all, if you're looking for a leslie simulator or a rotary type sound, definitely check out this pedal.

brumo4213's review (This content has been automatically translated from French)

Boss RT-20 Rotary Ensemble
This is a rotary modlisateur his cabin in the form of double effect pedals.
Choice for a guitar or a keyboard with a select button, a headphone output, input and output mono or Stereo.
Serves as a bypass pedals, the other ordering slow / fast.
By pressing two, we simulate a stoppage of the rotor and the two horns Aiges.
The technology is numrique. The slow and fast speed are adjustable sparment.Il is well reproduced the opposite direction of rotation between the rotor and the like on a real horn!
The LED display shows in blue the rotation of the rotor.
The LED display indicates the rotation in red cones.
The button "rise time" to simulate belts Entran dtendues more or less. A rglage way, the rotor takes longer than acclrer cones and even for dclration. At bottom, rotors and cones are synchronous. The rotor speed and the cones become scabs APRS rgime established.
A button "drive" to simulate a saturation well but be careful to correct the gain on the mixer and the legalization because you will open your ears!
Finally, a balance direct / effect, and determination of the effect, then a slecteur of four types of effects depending on the wishes DSIR.


The use is very simple, as the record because there are not too many parameter.
The RT20 does modlisation a leslie cab with adjustable saturation.


The effect is more Russian than the BOSS SE-70 that I have for 19 years but the technology and processors have been volumes ...
Too bad there's no SETTING THE slow and fast spares for the rotor and cones because there against by the SE-70, like rglage Acc lration also indpendant between the rotor and cones. Espron one day it will be a Intgr RT20 "Next-Generation" but that does not exist today ...
She uses a ELKA X705 28. Gnial, it is closer to the couple B3 and Leslie 122 for the X705, and Whereas c'tait rput dj as a clone of B3. And, no numrique but analog. This organ has nothing to envy ralisations Current Contents sinusodaux sounds or flute drawbars.
Only small BMOL: The blowing out of the organ as the RT20 will tend to emphasize more on the cones. But with a little filtering of white noise, everything falls into place.


RT 20 is my all Frache this week.
For the price of this, there is nothing wrong. Qualitprix good value and a solid Casing. A more than raliste Submitted in my BOSS SE-70 but less comprehensive rglages not trsgnant but for my use.
And my old Chorus BOSS CE-3 will be able to use something else. Rest try my trmolo BOSS TR-2 upstream branch to see ...
But when one of modlisateur trmolo / vibrato B3 complter ultimately this?
I would also have an AIM on / off and more and delivery PSA230 power supply but with a supplier offered a pack BOSS RT20 + BOSS PSA230 the same price ... Looking good ...
Otherwise BOSS provides 6 AA batteries of 1.5 V in the bote. But the power supply or batteries are prconiss because alkaline batteries last about 10 am, 6 hours of salt according to the instructions!

OoYeahTomiZePimP's review (This content has been automatically translated from French)

Boss RT-20 Rotary Ensemble
So we have a boss pedal in the line twin, as the RC-20XL.

I think my fellow testers have well explained the thing: a model of all that is digital!

A point to add: the ability to connect the keyboard on the device, provided to switch the button on the front side.
Note also can connect to two amps in stereo on stage or else!

Finally, we can put an expression pedal (boss of course, the same story with the SAP adapter ... € 24 with us anyway!) For real-time to vary the speed of HP.

Not because I put 10 for the digital, there may be more opportunities to put in the beast.
But hey, there, I compare with the Holy Grail of the Univibe: THE Roger Mayer (Pope effects Hendrix) Voodoo Vibe ... I had the privilege of trying to Angel Music (Valenciennes). [besides, she has yet to be! i was not able to offer it to the final (> 400 €)]
Indeed, one of Mayer includes a tremolo with selectable waveform.
In fact, the Voodoo Vibe is all analog!

As for the integrated overdrive, I'm pretty lenient ...
It is nice to add a crunchy note no more ...
But after the turn to starboard, is unthinkable without an equalizer beefy ass!
So here, add a disto OK, but if it is not able to set a minimum with a tone knob is a blow to stack with a total of 36 effects of the spray!

Hence the 5


I agree, the manual is pretty cheap ...

Anyway, after that the experiment for each
What matters is to find the sound you are looking.

For me, it was the sound of Jimi Univibe for my Start and that of Hammond for my keyboard: John Lord (Deep Purple) & Bernie Worrell (Parliament Funkaedelic)

Otherwise the consequences of setting the knobs are clear on the sound that comes out of your amp


While there, as I have the characteristics of sake, both here I want to tell you how I felt the way jimiz of sound when the knob to select the effect on IV!

THE best recording of Hendrix fire to feel the song remains the Univibe Machine Gun Live at the Fillmore East (soliiiiiii anthology for my part;)

Then with the keyboard, then the knob on I or II and rolls Poupoule!
Easily get the sound of Bernie the Elephant as the Colonel's Ghost Buckethead Claypool Bernie Brains (C2B3 for short) when he puts his two agreements on the continuous p ***** of Buckethead's solo (I recommend warmly album released in 2004)

In all, the boss takes up the pavement compared to the voodoo vibe ... but without the tremolo!
As it were, the sound is roots, I found easily on the SRV Cold Shot (album Could not Stand The Weather).


In short I am not disappointed, for a price divided by two compared to the roger mayer!

9 Pasqua, saying that Mayer is the very high end, but for the pros (Clapton used it on any album I know ...) or the rich (such p'tét c! ?!?)

That's my opinion after receiving two weeks ago and tested on Start and keyboard ...

8 because the addition of the overdrive is a reflection of what to do or not do better: add the phasing or other dac but if you can not adjust as you like ...
It is one that can do more can do less or I start something without going all the way!
Too bad ...

bouleux's review (This content has been automatically translated from French)

Boss RT-20 Rotary Ensemble
Much has been said in the post t previous ones. However I use this with a guitar (Fender Stratocaster). Construction mastoc, aa look solid.
I regret the absence of a switch.


The manual is Retailer same but I still took time to understand the use of the machine (I have been offered, so I did not have a trs pr ide Cise of what we could learn). qq After hours, I found great clean sounds (Pink Floyd style mid 70's) I like least with overdrive. I am still under Discoveries but I find the possibilities INTERESTED trs.


I do not have much to say. For me, the quality of sound is nickel (I never used to Leslie), with the strato particulirement. I still sounds as the possibility of discovering rglage and yet I do not use the expression pedals.


I use the pedals for two months. It is a gift, so I did not compare to other models. Considering the price, I would have probably not buy (it's expensive and I practice as a hobby), but I intend to keep it. In practice, I find beautiful sounds and more j'apprcie the pedals. I think we should try it with a guitar.

grozeil's review (This content has been automatically translated from French)

Boss RT-20 Rotary Ensemble
Good, well-t CHARACTERISTICS have Describes by Funkypopol.
The effect is ditable, but not as mmorisable dvelopps certain effects in this format by Boss Twin Pedal. Too bad.
The connection is complte, there's even a jack for an expression pedals. The format is a little large at first for a pedalboard, I prfr a simple but pedals use, we gain in comfort. -1 Point to go the lack of memory.


So I put a few dozen minutes to get a really nice sound. I thought it would be simpler, but there really is a lot of paramtres grate, including paramtres which dixit the manual, do not appear on a real Leslie 122. So, you can really fine tune the sound more prs.
The manual is succinct but sufficient, even for me ;-)


I never had the hands of Leslie, so I do not really have a point of comparison. The only comparison I could make is with the pedals of rotary dveloppe Line 6. J'tais actually went to buy the Line 6, but APRS test, I found the sound trsdcevant, trs muddy.
So, I eyeing towards Univibe (Dunlop, Voodoo Lab), but the lack of paramtres me a little scrap. So, I bought the RT-20 without even having tried. But hey, 159 in France, the risk limit even when silent. J'tais rticent just take my RT-20 because I had a Boss VF-hands, and simulations of COSM Rotary Embedded in this multi-effects I had not at all convinced.

It seems to me that the simulations are ralistes, I get much closer to me sounds of musicians known to use rotating speakers. My preferences in terms of simulation goes to THE FIRST (mode I) which reproduces the sound of the Leslie 122. APRS, the other options / modes are just variations of this simulation. The 4th mode is a simulation of Univibe, I do not like the masses (I wonder if I'm actually a fan of Univibe :-)).
A priori, the sounds of HP seemed to better simulate rapid turnover than those with slow rotation, although I managed to have a good rsultat also in this area.
The thing that makes me really tripper is that pressing on the two pedals simultanment, it activates a "breaker", a brake that stops gradually (this speed knob dpend the "rise time") rotating speakers. and you end up with a sound enough crmeux, warm, with nice bass, jazz in all. All I was looking for :-)
A small point less for the expression pedals that can rgler the speed of the speaker. I AIM we can activate the overdrive, could be a nice. The quality of the overdrive is not stunning, but hey, it's not so horriiiiiiiiiiiiiiible what some seem to say on sites like Harmony Central ... Srement of true aficionados of vintage vacuum that particular portfolio. Personally, I use it all fawn not, the fact that speakers switch rapidly rotating dj brings a semblance of overdrive mmmmmmhhh yum yum.
Another nice thing is that you can make a balance between the two speakers as they sound sweet prfre more aggressive. And then you can grate the amount of signal untreated and treated as we want to keep some of the timbre of his instrument.
In short, we plthore of rglages, I did not ask for much!


So I use it for only a few days, I will update as and a measure of my tests. I play a Chapman Stick on a keyboard amp, but I'm ending for use on sound, we'll see what a deal.
Report quality unbeatable price for me. As I said, before buying, j'tais priori rticent take me quite a Boss, because until then, I was operating with VF1 which did not satisfy me at the Rotary simus . It is with great mfiance that I finally convinced by RT-20 and honntement, I do not regret my choice.
Just something to finish: the screen to visualize the rotation of speakers, I'll be fine. It is not absolutely nothing, and was spending all pedalboard for a tree Nel. Frankly, it's corny ;-) supra (go hop least one point - well, with all these 9 / 10, did what average gnrale ...??? Ben 9 / 10; -)

funkypopol's review (This content has been automatically translated from French)

Boss RT-20 Rotary Ensemble
Boss RT-20 is a Leslie simulator, which is supposed to reproduce the sound of the Leslie model 122 (originally scheduled for sound with the Hammond organ). For that uses BOSS COSM technology developed by Roland.
The RT20 comes in the form of a double pedal (pedal twin) in the center with a "virtual rotor", which allows to visualize the speed of the two speakers that make up a leslie cab (gadget, but nice when same!).

Let's review the various controls of RT-20:

• Transition time adjustable speeds, slow and fast (RISE TIME)
• Overdrive
• Setting the slow speed position and fast position
• Adjustable balance between the rotors and the acute and severe
• 4 types of sounds, effects of standard rotary speaker sounding rock, UNI-V and so on.
• Switch guitar / keyboard

Taken INPUT A (MONO) jack (1 / 4 "), INPUT B jack (1 / 4") jack SPEED (EXP PEDAL) jack (1 / 4 "), PHONES jack (stereo 1 / 4") , OUTPUT A (MONO) jack (1 / 4 "), OUTPUT B Jack (1 / 4") jack adapter
• Power supply: LR6 (AA)) x 6, AC adapter (PSA series)


From a general point of view, no particular concern: getting started is quick.
One may regret the absence of a switch: the RT 20 is in service from the moment you enter the INPUT A jack. To turn it off, disconnect the plug.

What that is a Leslie?
2 speakers (one bass and treble) rotary, running at speeds faster or slower and give the characteristic hum. Once you understand the system, using the RT 20 is childish:
It regulates the speed, you set the acceleration of the rotation, you set the overdrive, it adjusts the balance between bass and treble, and now. Cons: speed is the same for the two speakers, then we would have liked an independent adjustment.


Personally, I use the RT20 clone in addition to a Hammond organ, the Viscount DB3. This one has very good sound but a B3 Leslie simulation to cry, which spoiled everything.
So that the sound seems authentic Leslie, in addition to a faithful modeling of process noise, it was also necessary to reproduce the defects of this type of vintage instrument. This side is "roots" which I believe gives full dimension to the Leslie.
With RT20, I really sound closer Hammond + Leslie: I really feel like playing on a B3 as the characteristics of Leslie are well reproduced. Oddly, the effect seems a little less well in slow speed (slow position) that fast, but overall it's very good simulation.


For comparison, I did a test between my config + DB3 and RT20 software from Native B4 with its own simulation Leslie. Appraisal: a tie for the sound, but great advantage for the couple at the DB3/RT20 gaming experience in real time. Not to mention that for the stage, I much prefer a keyboard 61 notes and pots to turn, a computer keyboard and mouse.
In terms of pesos, again it's interesting: I bought my nine DB3 € 700 and the Boss RT20 less than € 200, € 900 which makes for a near-perfect sound of Hammond, in any case perfect for me .
For information, the Korg Cx3 (€ 1900) and Roland VK8 (1800 €) are significantly more expensive.