Well, well, well. I just built this thing up. What a suprise - I loved it, which is a suprise seeing as I loath the sound of the "Tube Sound Fuzz" that this circuit seems to have taken it's inspiration from. I really love the Bias control and the tone control is very effective too. It's a much better distortion (In my opinion) than, say, a Rat. Pretty dynamic and cleans up well with the guitar volume pot. A nice find, I've recently started exploring CMOS technology with a view to developing my own distortion! I knew that invertors *could* be used to create a nice distortion as inside those little CMOS invertor blocks there are MOSFETs, and we all know how nice they are :-) Check the CD4069 datasheet here: http://www.datasheetcatalog.org/datasheets/90/206781_DS.pdf
Here's a demo video for the Reezafratzitz;
Anyhow, here is the Marketing blurb from the Emma website:"Just when you thought you had seen the strangest name for a stompbox, EMMA offers up the Reezafratzitz! Like it's unconventional handle, the RF-1 is a unique type of OD/Distortion unit that stands out in an extremely crowded playing field. The RF-1 offers incredibly rich, full-bodied crunch that is so close to tube-amp overdrive that you''d be hard pressed to choose which was which. The secret to the RF-1's amazing tone lies in it's Bias control. This knob allows the user to morph between Class B and Class A biasing, altering the harmonic structure of the signal and providing a much wider variety of tonal options than your standard distortion. In Class B mode, the RF-1 exhibits a thick, chunky grind similar to a Marshall or Fender amp. Class A mode provides sweet, singing saturation worthy of the finest Vox AC30. Additional controls for Level, Gain, and a Hi Boost/Hi Cut Tone circuit allow the user to fine tune the RF-1 to taste. When you're ready to set trends rather than follow them, the Reezafratzitz will provide the audio inspiration you need to set yourself apart!"
Here is a project put together by thn.technik;
You'll notice this project has a "Bass/mids" mod performed on it, this slight alteration adds a lot of new tones to the pedal and is well worth doing.
I must say a huge thanks to all those involved - you know who you are! For more info and build reports visit the freestompboxes.org forum.