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 Flextron DC14 by AXP is a Virtual Effect Audio Plugin. It functions as a VST Plugin.
Flextron DC14
Product Flextron DC14
Developer AXP
Price (MSRP) Free
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
 1.0.03    Download Released
System Requirements
Windows XP SP2 or higher
Audio Demos
Miscellaneous Information
Copy ProtectionNone

Flextron is a virtual-analog guitar amp based on a concept of the hybrid guitar distortion pedal I've built for myself a while ago. The prototype pedal in its turn was based on two commercial tube emulation technologies – Flexwave by Crate and Cooltron by VOX. This combination was discovered by accident when I was repairing my bandmate's VOX Bulldog distortion pedal. I didn't like the Bulldog that much, however I got interested in its low-voltage tube design so I assembled a copy on a test bench. On its own it has provided very little overdrive, just as expected, but when combined with the Crate Flexwave preamp (my favorite solid-state distortion) it has completed its already great tone, giving it more fullness and presence. I've used this arrangement for rehearsals and some gigs and got complemented for the tone.

Flextron goes a step further and accurately models a range of Crate solid-state amps powered by the Flexwave circuit. Every stage of the preamp signal path is carefully analyzed and modeled with the same attention to details as my previous SoftDrive GV and SoftAmp FM25 plugins.

The Flexwave amp design has evolved over the years. I counted 6 different variations. After careful analysis, I've narrowed down the scope to 3 models. The one I've played with was made in the late 90's and I think it's ahead of the pack. However in 2000's they have changed the gain channel structure significantly and after some consideration I've decided to model all three.

The Cooltron circuit in its turn stayed the same across their pedal range. I've tried a couple of different approaches to modeling it before settling on the final one. Since I've had a real physical implementation at my disposal I was able to successfully verify the accuracy of the digital model.

Interestingly, both Flexwave and Cooltron follow exactly the same idea – they essentially are an asymmetric clipping stage biased by the low-passed feedback signal. Having made my own SoftAmp 3OD model I can say that this is exactly how a real guitar amp triode stage works. The main difference is that Cooltron uses a 12AU7 tube running on 6V anode voltage for the authentic tube waveshaping, while Flexwave relies on an asymmetrically configured "rubber diode" pair to achieve the same effect.

In addition to the fully featured 3-channel preamp and a tube saturation stage, Flextron offers a dual-mode stereo reverb (algorithmic and convolution-based), a speaker simulator with two cabinet models and an ambience control (intended mainly for practising in headphones), a switchable order oversampling and a set of visualization instruments, such as an EQ curve plot and stage bias meters.

Just as with my previous plugins, every single control is remapped to produce linear response on a dB scale.

Additional details can be found in the bundled manual.


User Rated

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Discussion: Active


2 August 2014 at 6:28pmnr1killabee

Nice job, good amp emulation but the plugin eats lots of CPU on my PC.

4 August 2014 at 11:04pmAXP

Hey, thanks for the feedback. There are some specific components that are CPU-hungry, namely the Ambience control - set it to zero and see if it helps. Also reduce oversampling (4x is enough most of the time). There are some cases when the Speaker Sim and Spring Reverb could cause CPU spikes, we are currently discussing it in the support thread: http://www.kvraudio.com/forum/viewtopic.php?t=417324.

22 August 2014 at 8:02pmBoone777

I like it too. I compared the cab sim section to Nadir+Kalthallen IR trying to replace the cab sim section with something else. Altough some alternatives came up I find that the original sound really stand its own. Great set and forget tone.

6 September 2014 at 3:09pmmr-es335

Hello, .

The site is down...how may I be able to obtain this plugin?

Thank you.

6 September 2014 at 3:33pmBlackWinny

Can you PM me, I'll send you it in private (since it is a freeware).

6 September 2014 at 4:00pmAXP
The site will be up later tonight. Thanks for your interest.
6 September 2014 at 4:00pmAXP
The site will be up later tonight. Thanks for your interest.
6 September 2014 at 4:05pmBlackWinny

Ok. Nice! Your amps are really excellent! It would have been pity to loose them so quickly...

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Flextron DC14

Average user rating of 9.00 from 2 reviews

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