synthesizer

Thoughts on last night's performance

In this article I review my performance last night at the plug:dos headphone festival in San Francisco.

First, the venue itself. 5lowershop is in a warehouse near the junction of highways 280 and 101 in San Francisco. It’s at the edge of the Bernal Heights neighborhood.


The venue and its surroundings have that seedy edge-of-the-city feel that I probably wouldn’t want to live in but nonetheless often find intriguing and romantic. It’s just another part of the quintessentially “modern” world.

The interior matches the exterior, a jumble of areas within the warehouse, including the main performance area. The space is quite porous with the outside, and I noticed several cats wander though, including the grey fellow and a small black-and-white kitten. They were presumably feral cats attracted by the warmth, activity and possibility of food. Feral cats are an inevitable part of urban environments, but it’s still heartbreaking to see them this way. I was also concerned for them because of the dogs that were present, fortunately the dogs seemed to be pets and quite mellow.

The atmosphere of people crowded in a warehouse listening to headphones was quite unusual to say the least. Some of the performances were quite interesting, including a serinate for voice and hammer-dulcimer, and of course several acts mixing guitar, analog synthesizers and turntable. The analog synths didn’t strike me as a good fit for headphone performance, and thus avoided them myself (as described in my article on the preparation), but they did a good job of keeping the sound within a reasonable range.

Despite the best efforts of the organizers, whom I liked and thought did a good job overall, things tended to run rather late, and I ended up going on 9:40PM, two hours after my scheduled performance. But I think it went well musically, pretty much meeting my expectations for mixing ambient and rhythmic/punctuated material while keeping things mellow for the headphones. I did bounce around and repeat elements more than I expected, but such is the nature of improvisation, reacting as things unfold.

The equipment (Dell Laptop, Emulator X, E-MU 1616m, E-MU Xboard 25) performed flawlessly. I did make a direct recording on the laptop, and will be posting that shortly. I am also planning to make that the first release in my planned podcast series.

UPDATE: you can now listen to the audio from this performance. Enjoy!

Preparing for tomorrow's performance

My upcoming performance at the the plug.dos headphone festival provides some special challenges. Because the audience, both at the venue and online, will be using headphones, I need make sure my sounds and processes are headphone-safe, i.e., low volume with no clipping, glitching or large volume-spikes. More positively, I can take advantage of a uniform stereo listening environment with deliberate pan and positioning effects.

The need for steady volume and stability rules out the use of feedback and high-resonance filtering that I use in a lot of my recent music. Thus, the Evolver is out. Many of my Open Sound World patches are probably not approrpriate, though stable-volume patches are certainly doable.

I am focusing on Emulator X controlled with a MIDI keyboard (E-MU Xboard25). Thus, my preparations have focused on selecting existing sounds from the E-MU sound library that meet my technical and aesthetic requirements, and creating some new sounds. One preset that I spent a lot of time building is a modification of my additive synthesizer for Emulator X, consisting of eight independently controllable sinewaves. In addition to MIDI control of amplitude and frequency, I use a function generator to add amplitude modulations do the sinewave components of the timbre. Additionally, each “note” played has an independent pan position, spreading the sound across in the stereo field. I have also modified some existing sounds to include stable amplitude-modulation effects. The end result is a highly-controllable pallete of sounds from which I plan to make an ambient but punctuated sound scape, with a few rhythmic elements for good measure.

Logistically, this will be a very simple performance to travel and set up, just my laptop, the E-MU 1616m sound module, and the keyboard. I am looking forward to a relaxed, simple and enjoyable experience.

I'm not posting any advance examples, so you'll have to listen online to the show to hear what I'm describing. Hopefully I will be able to post a recording after the fact.








performance

catsynth pic: Reed Ghazala Tape Canvas Device

I was reviewing Get LoFi for yesterday's circuit-bending article, and came across a reference not only to Reed Ghazala, whom I also referenced, but a catsynth pic to boot!

Who knew the “father of circuit bending” was also a cat person? Then again, perhaps I shouldn't be surprised…

The tape canvas (illustrated above) itself is interesting as well, allowing expressive control of a device and process that is traditionally linear. It inspires me to revive my interest in musical reading of barcodes using a CueCat, which has the added advantage of continuing the feline theme.


The CueCat has proved a difficult device to work with, however. I have a modified version that gets beyond some of the proprietary issues and shows up as an HID device that can be read in OSW, but I have yet to make it work properly.

Adventures in Circuit Bending: Vtech Tiny Touch phone

Last evening I embarked on a circuit-bending project, and this forum provides me a unique opportunity to document the experience.

For those who are not familiar with circuit bending, it basically the process of modifying the electronics in existing audio devices, usually simple analog circuits in musical toys. In the process, one can add new expressive controls to create a unique, albiet “lo fi”, instrument. A great introduction on circuit bending can be found at Reed Ghazala's Art of Circuit Bending. Additionally the blog Get LoFi has a wealth of information and circuit bending projects and instruments.

This experiment involves the Vtech Tiny Touch phone. It plays a few simple phrases relating to numbers and colors as the buttons on the phone are pressed. You can listen to an example here. Vtech toys are good circuit-bending fodder, and I've tried the phones before. During my first attempt, I shorted out the integrated circuit (oops), which ended that effort. The second time I did a simple bend across a timing circuit that allowed me to alter the speed and pitch of the sound with a potentiometer. I had this instrument open for kids to play with during the my show at Zeum in San Francisco this past spring, which turned about to be a death sentence for it. One kid happily showed his parents and me the capacitor he managed to pull off the circuit board. This time I'm going more slowly and methodically, with the goal of a more interesting and robust instrument.

First, we open up the phone to reveal its guts (i.e., circuitry):

Now grab a test wire (i.e., with clips on the ends) and start looking for interesting “bends” by shorting different points in the circuit. In general, this is a hit or miss process and experimentation is the rule of the game. However, care should be taken to avoid shorts that could damage the audio circuits. In particular, stay clear of anything that connects directly to the batteries.

A rather effective short is opposite corners of the IC board, as illustrated by the pink dots in the closeup below:

Shorting these leads, which essentially drops the resistance to near zero, slows down a timer and thus the speed and pitch of the audio, as can be heard in this audio clip. Note the slower version of the telephone ring. From this result, one can conclude that varying the resistance changes the timing and pitch of the sound, in particular highwer resistance yields higher pitch, with infinite resistance (i.e., open circuit) restoring the original behavior. Such a bend is a good opportunity for a potentiometer to mechanically change the pitch, or a photocell to use light as a pitch control. For now, I am attaching a photocell using alligator clips:


Cupping my hand over the photocell and moving it closer and further while pressing buttons yields variable-pitch sound and beginnings of a new circuit-bent instrument.

I could stop here and make this bend permanent, but I would to continue with other options, including switching between photo, mechanical, and null modulation, as well routing other signals over this bend to create FM synthesis. I will continue to document this project here as I find more time to work on it.

catsynth pic: Gingerbread

MIT Media Lab assistant professor Dr. Joseph A. Paradiso includes the above photo of his old Himalayan cat Gingerbread atop a synthesizer cabinet as part of his web page documenting his modular synthesizer. His collection of modules and writings about synthesizers are quite impresesive, and I've spent a bit of time looking through them. That is one of the fun things about looking for these pictures of cats and synths: it often leads to something more interesting.

Dr. Paradiso's synthesizer has received note in Keyboard magazine, and he had a synth rig featured at the 2004 PrixArs Electronic festival. He has some great photos of synth rigs from the 1970's as well.

Actual Cat Synth

jfm3 of Ouroboros Complex posts about as literal a “CatSynth” pic as you can get, featuring his cat Kona and accoutrements as part of his rig. Cat aside, the rig and website include a wealth of personal experiences with analog synthesizer hacking as well as circuit bending (note the mod'ed Speak&Spell). Please give jfm3 and Kona a “catsynth welcome” by visiting their site.

DSI Evolver legal again in Kansas public schools

After the recent electoral defeats of Creationists on the Kansas school board, students are now free again to use the Evolver synthesizer from Dave Smith Instruments. Was the Evolver an unintended victim of the continuing assault on the theory of evolution and scientific reason, or part of an orchestrated effort to eliminate all electronic music in Kansas except for the DX7 electric piano patch used by wedding and bar-mitzvah bands?

Speaking of music spawned by the devil, I have been experimenting a lot lately with the use of feedback as the primary sound source for the filters instead of the starndard oscillators. The instability combined with the filters and multiple conversions between analog and digital in the signal path make for some very interesting results. I have posted an example here for your listening pleasure. Be forwarned, there are a lot of harsh high frequencies in this example, though the MP3 compression does help soften them a bit. Enjoy!

More Cats and Synthesizers

It looks like some others out there had the same idea. Check out this post at Create Digital Music featuring photos of animals with synthesizers. While the author is an admitted dog person, there are several cute cat pics, including this one from the Matrixsynth blog:

The synthesizer in this photo is the legendary and all-too-appropriate Octave CAT.

Also at Matrixsynth is Arak and Legion. Arak is handsome black cat, like Luna but with yellow eyes, more like a Bombay. Matrix also has an adorable shot of his black cat JD with a Sequential Circuits Multitrak. Check it out, it looks like he's actually reviewing patch specs.


Sadly, it sounds like Arak has passed away and JD isn't doing very well. My heart goes out to Matrix, Legion and their kitties. Our animal companions truly share our lives, even our odd hobbies.

If you would to submit your own images of cats and synthesizers for this blog, please use our handy submission page.