[sdiy] A different kind of polyphonic aftertouch

Amos controlvoltage at gmail.com
Sat Dec 16 11:22:19 CET 2017

This is the Buchla (/Moog) PianoBar, applied to typewriter keys instead of
piano keys. :)

(The pianobar used an infrared LED and phototransistor per key to get a
continuous analog measurement of key deflection.)

On Saturday, December 16, 2017, <rsdio at audiobanshee.com> wrote:

> A couple of things:
> First, USB is not necessarily the best choice for musical applications.
> It’s not more responsive, although it does have more bandwidth than classic
> MIDI. If a MIDI “device” has nothing queued up yet for transmission, then a
> new event will have a latency of 0.32 ms, or as little as 0.032 ms,
> depending upon how the receiver handles timing. A USB Device can support a
> typical average latency of 0.5 ms, but that’s only when the USB Host is
> designed to guarantee such latency. It’s quite possible for a USB Host to
> postpone USB traffic for a given Device, such that there is no upper limit
> on latency until you get to about 10 ms.
> If you’re willing to change over from classic MIDI to RTP-MIDI or any of
> the other modern transports, then you’re suddenly better than USB in
> basically all respects. Granted, the bandwidth limitations of classic MIDI
> are nothing to ignore, but we’re not necessarily stuck with only classic
> MIDI or USB-MIDI. Responsiveness is more than just bandwidth.
> Second, I don’t think that a typewriter keyboard is the best ergonomics
> for music. The mechanical design of a musical instrument is potentially a
> huge issue that isn’t solved merely by the availability of raw sensors.
> Although the Wooting seems promising, adapting it to musical applications
> could prove to be an involved endeavor. The Eigen technology is similar,
> and has four optical sensors per key, allowing for side-to-side and
> front-to-back motion detection as well as simple downward pressure. I don’t
> think it would be easy to build an Eigenharp from Wooting keys.
> That said, thanks for sharing. It’s certainly an interesting option,
> especially for folks who are already considering making their own musical
> controller.
> Brian Willoughby
> On Dec 13, 2017, at 6:49 PM, cheater00 cheater00 <cheater00 at gmail.com>
> wrote:
> > There's a new gamer keyboard from wooting.nl called wootong one. It
> uses DirectX joypad APIs and each key has continuous depth output. It's 160
> €. USB sure beats midi for responsiveness and the rgb lighting could have
> musical applications as well. What do you guys think?
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