Stomp King SK-6 Ro-Tube

Bob Leggitt | Saturday, 21 January 2012
Stomp King virtual effect pedal - SK-6 Ro-Tube

Okay, so there’s some good news, and some not so good news. The good news is that the new Stomp King SK-6 Ro-Tube sounds very good indeed. It’s a virtual valve/tube rotary speaker packed into a stomp box format. It has a very warm and obviously tube-type sound, great stereo, ease of use, etc… Unfortunately (and this is the not so good news), it doesn’t have a small footprint. For a VST effect, it’s quite a drain on resources, and has the biggest footprint of all the Stomp Kings. You should have no problem if you’re using a modern PC, but you’ll notice the high drain on old machines. However, I think if you’re looking for a really impressive-sounding VST rotary speaker effect, you won’t begrudge the SK-6 its tendency to guzzle CPU.

I’ll be leaving last year’s Real Rotor effect where it is for the time being, but effectively, this is its replacement.


This effect simulates the spin of a valve-type rotary speaker along the lines of a Leslie 122. The speaker and horn simulations ‘rotate’ independently of each other, and this is most noticed when the rotation speed is switched between Slow and fast Rates. There’s a good, solid bass end with considerable ‘throb’ when the effect is speeded up. The tone is about as non-digital as I imagine you could get with a VST effect. Big, warm, and retro. The Push control simulates the character of valves being driven hard, and with Push at maximum you should find the sound pretty gutsy, without things sounding like a distortion effect is being used. The obvious use would be to employ this effect in conjunction with an organ VSTi. You can pretty much route any old basic organ through this and it should sound good. But of course there’s also the option to use it on electric guitar sounds, electric pianos, etc.


The controls are very straightforward. Push governs the perceived 'loudness' of the amp. At zero, you don't get any 'push' and the sound is as clean as it gets. At the maximum of 11 (okay, so I've been watching Spinal Tap again), you get the feel of a loud valve amp. Slow/Fast dictates the speed of the rotation. At slow, you get a smooth chorale effect with attractive stereo 'rotation'. At fast, you get the characteristic Leslie tremolo. The Slow/Fast control is a knob, to fit in with the look of the other Stomp King effects, but there are just two positions, so it effectively performs as a switch. Switching between slow and fast gives a natural transition in keeping with the way a real rotary speaker would perform. Finally, Level sets the volume of the effect as compared with the raw signal.


To download, click the download link at the bottom of the page and then follow the prompt(s).

Place the .dll file in your VST Plugins folder, and when you start your VST host it should detect the new software. If you normally have to add your VST instruments and effects manually, you’ll need to use the same process here.

Please be aware that the Stomp King effects are home-made products, released as freeware, with no guarantees of any kind. Every effort is made to ensure that the effects work well and enhance your recordings. However, they cannot be tested on a wide range of systems, and therefore there exists the potential for problems. In downloading, you agree to absolve Planet Botch of all responsibility should a problem of any kind arise as a result of you downloading, installing and/or using the .dll file. 

Once the effect is installed, simply switch on the SK-6 by clicking its On/Off stomp component, then use the three parameter knobs to adjust the effect to taste. The SK-6 has digital readouts under its parameter knobs, allowing you to note your settings (and perhaps pass them on) when you dial in a combination you really like. 

Download the Stomp King SK-6 Ro-Tube

IF THE DIRECT LINK ABOVE STOPS WORKING, you can download the file from Github (direct link), or from its page on Github if the direct link presents a problem.

The rest of the range is available via the main VST FX Download Page.