Re: Elektrode system offer

David Rodger (
Fri, 16 Oct 1998 08:33:41 +1000

Robert Wechsler wrote...
>Would anyone be interested having one of these kits? What if we asked for
>$100? The kit includes:
> 1. Windows-based software to control signals of up to 10
>electrode sets.
> 2. 1 electrode set amplifier (a body-worn box somewhat smaller than a
>cigarette box)
> 3. A MIDI converter
> 4. Cable and electrode clips
> 5. 12 disposable electrodes (more are available from any good
>supply company)
> 6. Instructions

Since the body box (seemingly analog) is separate from the MIDI converter
(presumably A/D and conversion to MIDI), there is the possibility of using
a wireless system. Have you adapted the output of the body box for
transmission via a wireless microphone system?

Is the cable between the body box and the MIDI converter a parallel one or
are the channels digitized and multiplexed in the body box itself?

If the latter is the case, have you adapted the body box's output for
transmission via a wireless system (perhaps by FSK)?

>The output is standard MIDI. The program runs on windows, but to use it,
>you need a computer sound board with a MIDI input. Alternatively, you could
>run the output signal directly into your MIDI compatible device.

Or use it in an environment like Opcode's MAX (or even the MSP extensions
to MAX -- that's digital audio processing BTW).

>In this
>case, you can still set certain parameters with hardware controllers. (The
>software route has the advantage of allowing easy calibration of the muscle
>signals as well as control of range, sensitivity, channel and patch

I'm interested to know how you map the signals to MIDI controllers. When I
tested the WaveRider system, I found repeatability to be extremely low.
The output of the system was useful for toggling states or triggering
events rather than controlling any parameter with a range of discrete
values. Ed Severinghaus and Chris van Rallte have acknowledged the problem
with their BodySynth system (and have incorporated some neat features to
overcome it). Atau Tanaka appears to be using a similar approach with his
use of Biomuse, but I haven't talked to him about this.

Regards, David

David Rodger: Audio Engineering; Pool Operations; Aquatics Training
RESEARCH -- Motion Capture in Music --
ADZOHU -- Music and Dance from Ghana --
"It is always a thrill to observe music software making its descent from
the rarefied origins of a research tool, reaching its natural level as a
device to aid in the sale of alcoholic beverages." --David Zicarelli