All posts by Spunkytoofers

Adding Touch Sensitivity To Projects

by spunkytoofers


Fortune Cookies: Series of chaotic speech synths based on the Vtech Talking Whiz Kid circuit. Each one in the series is unique and an exploration into different interfaces. The Whiz Kid when circuit bent is what I consider bends under the category of glitch stream. A device is bent into streaming a series of endless/random flow of glitches and further bends will determine the course of it’s flow or interruption of flow.

In this particular version I’m using touch sensitivity to interact with the glitch streams. It’s a pretty simple concept you can apply to any touch based project so long as your components are metal to the touch and electrically isolated from the enclosure you’re using. This works for switches but this can also work very well for momentary buttons. If you find the right connections you can add an expressive touch sensitivity to your trigger and switches.

Strip a good amount of stranded wire and wrap the wire around the component’s base on the underside of the non conductive enclosure, then tighten the component down. If components have hardware such as washers it’s pretty easy just to thread the wire in between the washer and component (given it is thin yet sturdy enough) and then just tighten the component down to the enclosure making sure the wire is making contact with the metal casing of your component. Use a multimeter or other means to check the continuity of your your wire to the touchable part of your component.

How to add Getlofi LTC1799 to Casio Sk-1

by Spunkytoofers

I’ve gotten several requests on how to hook up the Casio Sk-1 with a Getlofi1799 Oscillator so I’ve quickly drawn up a diagram for hookups. According to other sources the clock input can be directly injected without cutting the trace. That may be possible but there are bootup problems if the clock isn’t at it’s original setting so you may need to add a switch regardless. The note about the optional 500 ohm resistor is only if you notice your sk-1 is now out of tune for wiring to the clock lines. this should drop pitch to a range where you can fine tune the keyboard back to A=440.  Access to the fine tuning is available thru the bottom plate of the sk-1.  Click thru on the pictures to get an exploded view of the diagram.

Spunkytoofers Dark Age Tone Generator

by Spunkytoofers

Circuit bent Yamaha mu5 multi-timbral synth with circuit bent MIDI interface by Spunkytoofers.  MIDI circuitry by highlyliquid. Precision LTC1799 oscillators by getlofi.

For more information: Spunkytoofers website

In the video below a 24 point patchbay is freely routed to manual control or midi. Circuit bent wavesequencing is controlled via midi from the dsi evolver. The evolver is used to send evolving sequences and is only used for control information of the midi interface. All sounds from the dark age tone generator is played via onboard interface.


The link below plays an mp3 of the dark age tone generator. MU5 + Evolver mixed/played live via midi wind controller. recorded direct, no processing.  Solo mu5 at 2:45

dave smith evolver and circuit bent yamaha mu5

Spunkytoofer’s Open Source Circuit Bent Interface

by Daniel Park

There comes a time when it seems every circuit bender hits a wall. I’ve been looking at the wall for a long time and no matter how many times I looked at it the only solution seemed to work with and learn the MIDI protocol.  In short MIDI is a digital protocol developed in the early 80’s by the likes of Dave Smith, Yamaha, Korg, Roland and other big synth manufacturers at that time. So control information and the synths had a standardization in order to communicate with each other between different manufacturers of synthesizers and controllers.

There are a lot of instruments that are circuit bendable that are MIDI capable. Unfortunately some of these MIDI capable instruments are not implemented very well with the protocol. Fortunately there are great devices by companies that really took MIDI and implemented in such ways that offer extremely detailed control over sound that is useful to musicians, sound designers and composers.

We are all familiar with circuit bent toys, they are cheap, safe to work with, and great to learn on. Some can produce a very surprising type of audio output from circuit bending. More often then not if you see a circuit bent performance by a circuit bender: their table is  full of many different toys. This variety is often mixed in real time to produced a shifting array of unusual sounds.  I’ve found each toy is like a “patch” which typically any musician using MIDI can scroll through a lot of patches during a performance. That is only possible through digital interfaces.  As a musician and circuit bender that has lugged around many different bent devices through many city streets, transportation systems, and airports I can say that this is very unpractical for non-benders and professional musicians to carry around many different bent instruments for the sake of having different “patches” during a performance.

Professional digital synthesizers that are implemented well over MIDI will offer a modulation matrix, several MIDI channels (16-32 different voices) of different programmed sounds to play at once with each sound having precise control over each sound’s parameters and triggering. They will allow precise detail in editing and how your control information interacts with customized bent sounds.

When we look at instruments without MIDI we are looking at the device itself and the bender’s hardware designed interface. Often these are strewn with fragile components located on odd shaped enclosures with an interface that makes sense to the bender but often can be very confusing to anyone else. Once the interface is made there is no other way to communicate with the device with your controllers and other equipment in the studio. Depending on the bent interface you are limited to the controls it offers. Whether its a homebrew sequencer or a bunch of switches, a clunky patchbay with lots of cables, you as a musician would have no say in how to communicate with the instrument or whether or not you prefer the patchcables, tons of switches, etc.. unless of course the musician would choose to DIY which is ultimately the best way to approach circuit bending imo, in your own way.

The problem is that I circuit bend professionally and I’ve been listening to complaints of professionals in regards to circuit bent instruments: they’re unstable, hard to travel with, I can’t integrate my existing controllers with the instrument, they are just toys that are severely limited. In response I decided to work with rack synths because they can be racked safely without damage during travel and the ones I’ve been working with are true professional instruments. All the bends are  informed by correctly addressing each chip to ensure stability and by not cross bending any chips on the build.


This is a recent release by Spunkytoofers Electronics called the Wavecaper. A circuit bent Alesis QSR Quadrasynth. It features extensive MIDI implementation and a deep synthesis archeticture as well as a comprehensive effects processor and a fully editable drum synth. With this design I wanted the entire bent interface under MIDI control. Any MIDI source: MIDI cc’s, program changes, tempo synch, MIDI machine commands, notation can be routed to any destination on the circuit bent interface via sysex programming. The onboard modulation matrix on the Alesis Quadrasynth has 6 source/destination for the synthesizer itself, 2 source/destination for the fx processor and the added MIDI circuitry for the bent interface adds another 12 source/destinations. In total you have a 20 source/destination modulation matrix. Probally one of the largest I’ve seen on a MIDI controlled hardware synth.

The circuit bent interface features two patch bays on a bank of rotary switches. One patch bay is 10 points dedicated to the effects processor bends while the other patch bay  is 24 points dedicated to the oscillator bends.  With rotaries you can get creative and efficient. No more massive amounts of drilling for point to point patch bays. With rotaries you can select your bends, stack your bends so quickly that if you are sending the rotaries sequenced information you can custom circuit bend your oscillator waveforms, effects and the sample rate on the fly. This is somewhat reminiscent of wave sequencing although this is definately much more unusual and bizarre and completely open to programming and free sequencing and control.

Rather than go into details of exactly how I bent this I want to share some amazing little creations by other benders. These are little plug ins that circuit benders can use rather then develop their own circuitry that is time consuming.  Following in the spirit of circuit bending’s immediacy I find these tools exceptionally invaluable.

The first one is by the owner of this blog, Getlofi.  Alex has created the LTC1799 oscillator kit which allows you to replace the clocks of various functions on devices and control them under variable controls like knobs. in my implementation of the circuit bent Quadrasynth I have the LTC1799 controlling the overall sample rate. The sample rate is controlled via a knob or switchable to MIDI control.

The second device is by Highlyliquid called the MPA, it is a decoder kit that offers potentiometer control in ranges from 10k, 50k or 100k. I have the mpa controlling the LTC1799 kit. Since the LTC1799 offers such stable control and the MPA handles very dense midi information without any hitches these synch up perfectly with each other.

The third device was critical. Sometimes if you do not have true mechanical switches you will not get a proper bend. Any amount of capacitance, resistance, and electronic leakage into the contacts you wish to bend can cause a bend to not sound right or even make the instrument less playable!!!  I tried building my own circuits for quite awhile and spent much more time then I like trying to develop a circuit but the solution and the life saver was highly-liquid msa-r kit which has 8 reed relay switches under midi that offer true mechanical connections that are electronically isolated.

These products allow you to get to your intended results much quicker as a bender. Just like when we approach bending to get quick results over existing devices we do not have to develop deep programmable synthesizers ourselves and do everything ourselves..with these kinds of resources availble to us we no longer have to stare at walls, but can now focus back on what I hope is what originally got us into this circuit bending mess in the first place. The music!



more information can be found here: