2014

Barber Pole Kind of Thing - 2:01 - An attempt at a Shepard tone. Not completely successful, but not bad.

Continuous Automata 2014 - 4:04 - Another track created using a continuous automata to make the spectra. I still haven't hit on something I really like with this method; I guess I'll keep trying.

Guitar 1- 2:57 - An illustration of a crazy guitar effect I wrote in Csound. It is a quad-envelope-controlled-ring modulation deal.

2013

Simple Composition 1 - 2:13 - A simple composition idea. Basically, three instruments play a loop of three notes, with rhythms in a four note cycle, so the combinations of notes at any one instant vary throughout. There are some changes in rhythm, too, by shortening the scale of the rhythms, and some timbre changes. Actually harmonious.

Triangle Composition - 4:00 - Ten balls move linearly at various constant speeds, bouncing off the sides. Every triangle formed by these balls is drawn, the color determined by how equilateral the triangle is (redder = more equilateral). A sound event is generated for each triangle, 60 times per second, determined by the size, location and equilaterality (?) of the triangle. There is an accompanying video.

RPM'12

All tracks recorded during February 2012 for the RPM Challenge 2012.

You can download all tracks and the liner notes as a zip file.

You can download the liner notes as a pdf which you can fold and glue into a CD envelope.

I was really busy this February, with drawing, cycling, and too many cheating students in my classes, so my ideas were pretty scattered. I think this was successful, though, in the fact that I got a few new techniques tried, and an old one or two expanded on.

1. Temporary Rhythms 2 - 5:10 - This is a followup to last year's Temporary Rhythms. The idea is the same: a set of random rhythms (on a 16 beat measure) are generated, and gradually combined in different combinations and with different "instruments". For this one, I also layered half-speed and quarter-speed versions of the rhythms, too, so it's nice and thick, and it gets thicker as the track progresses, but I wish I'd pushed it a bit more. Next year I think I'll try something similar, but with more extreme sounds.

2. Granular 1 - 8:20 - This is a pile of one-wavelength sine wave sound "grains", thrown out on the timeline with varying densities and varying pitch centers. I was hoping for a little more variety in the sound, but I think the rain-like nature and the roaring bass parts are good.

3. Sines Inside Sines 1 - 1:00 - A very old idea which I have recently come back to. I recently found how to write sound files with a Perl script, and this allows me total control of the final result, plus it gives me access to proper trigonometric functions (which I have had problems with in Csound). So, the idea is simple: create a sound file from a straight-up mathematical function. For this track, I define three functions of the form

and then the output waveform is essentially f(t)=f₁(t) f₂(t) f₃(t).

This track turned out nicely crunchy. The challenge with this kind of stuff is to get the sounds to be interesting without going beyond the limits of the 44100 samples-per-second system (essentially, you have to watch that the derivative of the functions do not get too great).

4. Frequency Modulation 1 - 5:02 - This is perhaps my favorite track on the CD. This again was created in Perl, with functions of the form

which goes twenty deep. The function you hear in this track changes periodically, more and more rapidly until the last 90 seconds or so when it changes at a constant rate. I really like the types of sounds this method generates, though I haven't played with it long enough to find anything that changes nicely over time by itself.

5. Modular Arithmetic, Mostly 1 - 3:20 - This was also created in Perl. The idea was to use no standard oscillator-like components, like sinusoidal functions. This was created entirely with integer operations. Essentially the i-th sample in the track is determined by testing i as an integer against various moduli and conditions which themselves change as the track progresses. I'm really happy with the unexpected nature of this track and some of the timbres are just great, and particularly the change around 31 seconds in.

6. All Together - 8:00 - Created with Csound (QuteCsound actually). I had been really enjoying the sounds I was getting in QuteCound just by letting five or six oscillators interfere with each other, so I set up a bunch of oscillators with linearly changing frequencies interfere with each other, mixing and combining them in various ways and let it go. This was the last track I made this year, and I probably made it a little longer than it needs to be but I like a lot of the timbres, and the blatant "electronic" feel of it.

7. Sines Inside Sines 2 - 5:00 - Another like track 3, but with a much more mellow feel. Same function type, with different coefficients and more of them.

RPM'11

2011 was the first RPM Challenge I completed! I made just over 36 minutes of sound in nine tracks, and they don't all completely sound awful. Here they are:

1. Pride and Enjoyment - 5:00

This is a basic rhythm composition using an idea I've been working for a long time. Take snippets of speech, say, of fixed length (in this piece, 0.9 seconds). These are taken at random from a longer sample. Each snippet will be looped over and over, so there is the rhythm resulting from the fixed length of the snippet, but then there is also rhythm caused by the content of the snippet. By overlaying these loops, and starting and stopping them at various times, different combinations of rhythms result.

In the middle of the track, ring modulation is applied to some of the loops to give a more colorful sound.

The sample is taken from a record I have which apparently was given to folks considering buying a boat as part of the boat company's marketing. It seems that owning a boat involves some kind of pride, along with enjoyment.

2. Quasi CA Spectrum 5 - 5:00

I struggled with this compositional idea all month. I think there is more to get out of it, but this is as good as I could get in February.

The idea is to have the spectrum of the sound at any instant be a function of the spectrum of the sound at the last instant. The spectrum is a set of amplitudes at 50 fixed frequencies (I will definitely use more in the future). Every 0.01 seconds, these amplitudes are modified according to a function which depends solely on the set of amplitudes. This is similar to a one-dimensional cellular automata (the difference being that in a CA, there tend to be a finite number of "states", but here the states are the amplitudes, so they are, theoretically, infinitely variable).

I think I need to go back to some basic CA methods, and see what kinds of sound I can get out of them, and then gradually add complexity, so that I can get a better idea of what is possible.

3. Linear Transformation Noise - 8:00

This is similar to the last track, in that the spectrum at each instant is a function of the spectrum at the previous instant. Each spectrum is treated as a vector, and this vector is multiplied by a fixed, randomly generated matrix to create a target vector and a weighted average of the original vector and the target vector are created. This weighted average vector is the next spectrum.

If this process is allowed to continue, the result will eventually be noise, as the spectrum moves asymptotically toward having all equal amplitudes. So, occasionally, parts of the spectrum are zeroed, or otherwise changed, to create a more varying sound.

The Csound score file for this is the largest I've ever produced. It is 1400 megabytes.

4. Finger Rodeo - 2:13

This started as a dare. Some time in February, Jenni and I were walking to work. A man driving a truck stopped to let us pass, and waved a finger in our direction as some kind of communication. I suggested that he was envisioning a tiny rodeo: I mimicked him saying "Ya-Hoo!" as he waggled his finger in a circular fashion, and made up the song on the spot: three descending chords plus the lyric "Finger Rodeo" over and over. I said it should be my next RPM track, and Jenni dared me to do it, and so I did it.

Two vocal layers, one guitar, and then massive manipulation via vocoders I wrote in Csound. The classic vocoder uses synthetic waveforms to approximately reconstruct an audio signal. With a small number of waveforms, a robot-type voice results. This is the effect I applied to the guitar. For the vocals, I used filtered noise instead of nice waveforms.

5. Temporary Rhythms - 5:04

Various looped rhythms which start and then end autonomously. I worked on this to get the various waveforms to be nicely varied, and, with the addition of reverb here and there, I think it has an okay sound.

6. Four Prepared Music Boxes - 3:32

My welding teacher told me about an idea she had to modify music boxes by grinding off the little nubs on the cylinder, and then adding nubs with solder. This got me thinking of other ways to modify them. I got four music boxes (which all play theme music from popular soap operas) and removed the steel comb and turned it upside down, so that high notes would be low and vice versa. I learned when I tried this that the comb is shaped so that playing it upside down is not as easy as in the normal direction: the comb is asymmetrical. Consequently, the sound is extra plinky. To hold the comb down, I had to use binder clips, since the screw holes are also asymmetrical. The binder clips add additional resonating.

Each box was recorded separately, and this track is all of them mixed together. The music boxes have a flywheel to smooth out the power transmission from the wound spring to the cylinder, and you can hear the humming of the flywheels on this recording.

7. FDR - 3:56

The same idea as the first track. Here the snippets are longer, and there is no ring modulation in the middle. This recording of FDR has more interesting sounds in it than the sample for the first track.

8. Inverted Guitar - 0:47

This is one of my pet ideas: the spectral inversion of sound. For this track, I took an old recording I made playing acoustic guitar, and modified it using Csound's phase vocoder capabilities. I then messed with the phase vocoder during resynthesis to essentially invert the spectrum over the course of the track: high frequencies become low, and vice versa.

9. Out of Work - 2:39

An old sample from Dragnet about the effects of computers on labor.

Another idea I have been trying for a long time is comparison. Considering two samples (or other waveforms) as functions of time, f(t) and g(t) say, we can create a new waveform such as h(t)=max(f(t),g(t)). This often produces quite a mess. Here, the Dragnet sample is "maxed" with a few fairly low frequency oscillators. As the oscillators accumulate, the voice is drowned out, which I thought amusingly metaphorical (or metaphorically amusing).

RPM'10

Four Things (5:23, stereo, mp3)

A type of dessimation of a sample, spread over 5 minutes. For RPM'10.

Avocado Pesthole (4:00, stereo, mp3)

Thicker Csound sounds than my usual. For RPM'10.

Yesterday Starts with Yes (5:03, stereo, mp3)

Another dense Csound thing. For RPM'10.

Bliptronic suite (7:43, stereo, mp3)

My brother Chris gave me a Bliptronic 5000 for Christmas, and I used it to create this triptych of little pieces.

pascal's triangle mod 2 spectrum (10 seconds, stereo, mp3)
pascal's triangle mod 5 spectrum (50 seconds, stereo, mp3)

Two tracks from the '10 RPM Challenge. Made with Csound. The spectra are made from Pascal's triangle modulo 2 or 5 (i.e., cells of Pascal's triangle, viewed horizontally, which are congruent to 0 or 2 mod 5 correspond to sound events).

RPM'09

cellular automata spectrum (60 seconds, stereo, 0.9 MB mp3)

This was one of two tracks I made for the '09 RPM Challenge. Made with Csound. The idea is the the sonogram of the track is a one-dimensional cellular automata. Each iteration of the CA corresponds to a short span of time, which gets shorter as the track progresses, just to give the thing some kind of change. I think I had 100 different frequencies, each of which correspond to a cell of the CA.

infamy oscillators (60 seconds, stereo, 0.9 MB mp3)

This was one of two tracks I made for the '09 RPM Challenge. It's really noisy. Made with Csound.