by Klutzy McFumblefingers (aka Larry Dunn)

Week 3 of Synth in Place, the online course in DIY synthesizers taught by Kirk Pearson of Dogbotic sound labs, in collaboration with Thingamajigs, focused on two things: talk boxes and learning to solder.

One of our homework assignments from week 2 was to select a piece of music we like that makes use of some sort of machine/electronic manipulation of the human voice. My choice was rocker Joe Walsh’s 1973 mega-hit Rocky Mountain Way. When this song debuted, it was my first exposure to the use of the talk box, and I think its first use in rock & roll. In this live performance from the 2004 Crossroads Guitar Festival (below, starting about 3:20), you’ll see Joe switch guitars and move to a rig that includes a length of clear poly tubing stuck into his mouth. Joe starts vocalizing other-worldly sounds along with his guitar.

At, and since, the time I first heard this, I would describe it as “Joe is singing through his guitar.” But, as we learned in class, that is the opposite of what is happening. The sound from his guitar is playing into his mouth, from a speaker that is hooked up to that tubing. So what we are hearing is the sound of the guitar plus whatever sounds Joe vocalizes, using his own “human talk-box” (more on that later), and the combined, other-worldly sounds are then amplified through his microphone.

It turns out that a talk box is an exceedingly simple thing to build. The illustration above gives a rough idea of how the rig goes together. The red box marked “HOW YOU DO THIS IS THE TRICKY PART” requires only some simple electronics, essentially the oscillator circuit we have already built, plus a plastic funnel to wedge the speaker into (aimed at the small end of the funnel) and a length of tubing to bring it to your mouth.

We focused on the talk box in class, in part because it is so simple to make and could be a fun component of any DIY synths we might build. But it is also instructive in understanding the whole concept of synthesizing sound. The way a talk box works is remarkably similar to the way the human body synthesizes sounds, such as speech, using the combination of muscles and other structures that make up the human voice track. The diaphragm is the oscillator in human voice synthesis, and the throat, tongue, teeth, and lips are the filters that can be contorted into various shapes to make the sounds that are the building blocks of audible speech.

The ever-clever linguists of the International Phonetics Association have codified all the different sounds the human voice track can make in the International Phonetic Alphabet. Each of these sounds are classified as to which body organs are used to make them. You can demonstrate some of this for yourself, using The Pink Trombone site where you can interactively manipulate the human voice track and observe the resulting changes in the sounds produced.

The other focus of our week 3 class was on soldering, which is the key to migrating the oscillator circuits we made in week 2 from the prototyping breadboard environment to a permanent home on a circuit board. Soldering is both incredibly easy, and yet quite dangerous if you are not careful. That thing operates at about 700° Fahrenheit, and takes steady hands and mindfulness about where you set it down and how you pick it up. And the solder, as it melts, gives off some noxious fumes. I’m not at all sure septuagenarian Klutzy McFumblefingers with chronic lung disease (that’s me) is going to actually be doing any soldering. But it is still fun to learn how it is done and what it enables you to do.

After soldering all our oscillator components onto the circuit board, our next step is to morph this puppy into a talk box. We just need to solder connections to a small circular speaker into our circuit board, use a hot glue gun to cement the speaker, face-down, into the small end of a plastic funnel, and slather some silicone caulk over the back of the speaker so the sound doesn’t leak out backwards. Once the caulk is good and dry, attach the poly tubing to the funnel, then fire it up and start making your own electronic music with your mouth!

Before wrapping up this week’s post, I’ll call your attention to a real world example of just the sort of DIY synths we’re aiming to build. I happened to catch the video below in a post from the International Contemporary Ensemble‘s recently completed Ensemble Evolution summer workshop, presented in collaboration with The New School. Ensemble Evolution participant Leni Kreienberg is a musician and performance artist. Her primary practice focuses on voice and electronic creation and performance, aspiring to connect and blend genres. Her latest work focuses on using dance and movement-derived data to feed into musical computer systems. Here is Leni Kreienberg’s playground, from 2019.

Finally, if you’re wondering about that featured image on this post, I’ve so far neglected to point out that our class mascot is Dynomutt, the star of a spinoff from The Scooby-Do Show, from Hanna-Barberra, titled Dynomutt, Dog Wonder. According to Wikipedia, the show “centers on a Batman-esque superhero, the Blue Falcon, and his assistant, Dynomutt, a bumbling, yet effective robotic dog who can produce a seemingly infinite number of mechanical devices from his body.” Sadly, Dynomutt suffered the cruel Hollywood fate of being cancelled, in 1977, after just one season. But, take heart. Dynomutt is apparently back, in the brand new SCOOB! feature-length film.