Named for Curtis Roads, Curtis is an iPad and iPhone/iPod touch application that implements granular sound processing – a technique, imagined early on by the composer Xenakis, which divides sound into tiny granules, allowing more liquid modification of the audio. Roads brought this idea to digital synthesis, and the results can transform recorded samples in pitch and time.

Composer, producer, and sound designer Richard Devine has long made use of granular techniques in his own work, so it’s little surprise Richard is turning his sonic compositional efforts to the iPad app. The latest release includes a new sound set he designed, but he also writes CDM to point out a track he’s shared on SoundCloud, free to download and hear and for your remixing and re-compositional use.

The track is a composition of samples, and it shows just how much you can do with recorded audio:

This piece is a Acousmatic composition based on everyday found objects. I recorded various wine glasses, gears, metal, motors, Ratchets, chimes, croaking frog scraper, Indian bells, Tibetan Singing Bowls, Santoor, waterphone, piano, hematite magnets, processed voice, underwater ambiances, computer, and sprinkled bits of Buchla 200e/Doepfer Euro rack Modular.

All of the sounds originally captured at 24-bit 96khz with a Neumann RSM 191 A/S stereo shotgun mic, SMK4060 Stereo Matched 4060-BM Miniature Omnidirectional Microphones and Sound Devices 702 recorder.

Objects Of Granularity by RichardDevine

If you want to try out Curtis, you can do so on both iPad (pictured above) and iPhone:

Curtis for iPad
Curtis Heavy for iPhone

I love the geometric/vector-style twist on the wave display. New in the recent 1.1 release: pitch control, echo effect, volume control … and the all-important MP3 import. (Usually working with uncompressed files is more successful, however. With WAV or MP3 files, simply drag-and-drop files from iTunes.)

In other sound design experiments, Richard records an insect’s footsteps inside a box, recorded on a catch-and-release program, from earlier this summer.

Found a large Velvet Ant walking on my driveway today, and couldn’t help but notice the odd sounds this insect was making. The recording is of the insect crawling around inside a cardboard box, before I let it go back into my backyard. The Velvet Ant, also known as the “Cow Killer” is actually not an ant, but a wasp. I recorded this with 2 DPA 4060 Lav’s and Sound Devices 702 recorder at 24bit-96Khz.

Recording of a Velvet Ant. by RichardDevine

140 / curtis + thumb piano from m~fischer on Vimeo.

Synthesis geeks are creating some fun sonic toys for the iPhone. There’s no reason you couldn’t plug in an iPod touch or your phone into a mixer and use them in live or studio creations for a little variety. And as mobile platforms grow in capabilities, other platforms should be close behind. (Not to mention, you can always rescue an entire iPod or PDA and run Pd, often for just the few dollars an app costs!)

At top, the granular sampling app Curtis captures sound from a thumb piano. Curtis costs justs a dollar, but allows you to sample, then visually manipulate recorded sound, using granular techniques. A “smooth” synthesis engine is upcoming, but I rather like the lo-fi sound — hope you’ll allow us to switch engines with a toggle. As seen at Synthtopia.

the strange agency [makers of Curtis, other apps]

The app is named for Curtis Roads, who did much of the seminal research into making granular techniques a technical reality. See his book Microsound
for an excellent overview of compositional, historical, acoustical, theoretical, musical, and, well, every possible aspect of this influential sonic practice. Have a look at the documentary on Roads and granular music we saw last month.

Segue – one early practitioner of granular music was Iannis Xenakis!

iGendyn is a new, free mobile application built around the GENeral DYNamic stochastic synthesis approach of Xenakis: “Imagine a set of control points (CPs) which together define the shape of a time domain waveform; with each new cycle through this waveform, their relative positions are updated using probabilistic distributions.” And yes, that’s GENDYN as in General Dynamic – not, in fact, a character from The Lord of the Rings.

Got that? In the default algorithm, X is amplitude, Y determines how quickly you scan through control points to produce the sound, and tilt changes probability. In other words, whether you understand the underlying approach or not (and hearing is always better, anyway), you can tilt your iPhone around and explore networks of probabilistic sounds.

iGendyn Homepage
iTunes App Store Link

Author Dr. Nick Collins is co-editor of The SuperCollider Book, upcoming from MIT Press, as well as The Cambridge Companion to Electronic Music. Thanks to Raub Roy for the tip!

Meanwhile, mother of all synth-geeky iPhone apps finally got its 1.1 update approved, so have a go with Jasuto 1.1 for a really terrific look at what modular synthesis could be. Jasuto also has a desktop VST version and the two will be able to integrate, so you have lots of possibilities here.