Having made my own SoftAmp 3OD model I can say that this is exactly how a real guitar amp triode stage works. Interestingly, both Flexwave and Cooltron follow exactly the same idea – they essentially are an asymmetric clipping stage biased by the low-passed feedback signal. Since I've had a real physical implementation at my disposal I was able to successfully verify the accuracy of the digital model. I've tried a couple of different approaches to modeling it before settling on the final one.

The Cooltron circuit in its turn stayed the same across their pedal range. However in 2000's they have changed the gain channel structure significantly and after some consideration I've decided to model all three. The one I've played with was made in the late 90's and I think it's ahead of the pack. After careful analysis, I've narrowed down the scope to 3 models. The Flexwave amp design has evolved over the years. 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. I've used this arrangement for rehearsals and some gigs and got complemented for the tone.įlextron goes a step further and accurately models a range of Crate solid-state amps powered by the Flexwave circuit. 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 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. This combination was discovered by accident when I was repairing my bandmate's VOX Bulldog distortion pedal.

The prototype pedal in its turn was based on two commercial tube emulation technologies – Flexwave by Crate and Cooltron by VOX. It's based on a concept of the hybrid guitar distortion pedal I've built for myself a while ago.

Flextron is a virtual-analog guitar amp made for KVR DC14.

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