topot_controller

The first basic idea of the glitch-free playback model (a
better, less marketingy name is probably timer-based audio
scheduling which is the term I internally use in the PA codebase)
is to no longer depend on sound card interrupts to schedule audio but
use system timers instead. System timers are far more flexible then
the fragment-based sound card timers. They can be reconfigured at any
time, and have a granularity that is independant from any buffer
metrics of the sound card. The second basic idea is to use playback
buffers that are as large as possible, up to a limit of 2s or 5s. The
third basic idea is to allow rewriting of the hardware buffer at any
time. This allows instant reaction on user-input (i.e. pause/seek
requests in your music player, or instant event sounds) although the
huge latency imposed by the hardware playback buffer would suggest
otherwise.

Paul von Janko was born in western Hungary in 1856. He was trained as a mathematician and became a musician and engineer, studying under physiologist and physicist Hermann von Helmholtz.
In 1882, he patented a new form of keyboard layout, designed to allow the player to cover a wider span of notes with each hand and to make all keys equally easy to play. Janko's keyboard drew upon earlier designs by Conrad Henfling (1708), Johann Rohleder (1791) and William Lunn (1843).
He used short narrow keys akin to buttons, and stacked them up to form six tiers. The notes were arranged in whole-tone intervals. The first tier, the third and the fifth play a whole-tone scale beginning from C.
The secound, fourth and sixth tiers play a whole-tone scale beginning from C#.
The shape and fingering of a given scale or chord is the same in any key and the octave span is reduced to 5" as opposed to 6-1/2" on a normal piano. In 1886, RW Kurka incorporated a
Janko keyboard into a piano, and Paul von Janko himself demonstrated it in Vienna, playing works by Liszt, Schubert, and Chopin.

The main part of it contains a list which
I have compiled over a number of years of companies that make input devices
and technologies. I have done this as part of the research for a book which
I am preparing.

Pretty accurate-ish timing in python

 

Python's time.sleep() is rather bad for accurate timing.

It can sleep for less time than requested, if there's an interrupt.

Or longer, depending on what the scheduler is up to.

Make your own physical sweaty interactive computer music interface

• While knowing very little about electronics

• And only spending a few dollars.

Previous research demonstrated that:

• Making your own MIDI interfaces is difficult and expensive.

• In fact you have to buy silly programmable EPROMs and shit.

The VMX VJ is the utlimate USB MIDI controller for VJs

- 99 fully assignable controllers
- Plug & Play Windows XP & MAC OS X, Linux support with USB drivers
- 2 jogs and 2 cross fader for live video scratching
- 8 tracks with soft touch fader
- 20 knobs
- 28 switches (loops, play, pause, replay etc ...)
- 39 radio buttons (special FX...)
- dim. 29x41 cm - same as a 17" laptop
- white steel

This document is a introduction to the asynchronous programming model, and
to Twisted's Deferred abstraction, which symbolises a 'promised' result and
which can pass an eventual result to handler functions.

This document is a guide to the behaviour of the twisted.internet.defer.Deferred object, and to various
ways you can use them when they are returned by functions.

Slut is a programming framework for generative, synthetic, interactive,
network-enabled graphics. Slut generates images from processes.