[sdiy] A different kind of polyphonic aftertouch

Mike HEQX mike at heqx.com
Sun Dec 17 05:45:04 CET 2017

I have overlooked this type of sensing arrangement in key form, but it 
seems a good way to do certain things.  Roman suggested a sensor which I 
am going to look into also.

This type of linear sensing can also sense velocity just like two 
switches do now in most keybeds, just by setting two thresholds. So you 
get the linear and switching at the same time and it's adjustable. Very 

I hear you Brian Willoughby, and I think we would need to reformat the 
key layout. I would not want to use a Wooting straight up, that would be 
strange no? Those keys are sort of fake keyswitches with a hole in the 
bottom. There may be other gadgets that can be used to make the same thing.


On 12/16/2017 5:22 AM, Amos wrote:
> 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 
> <mailto: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 <mailto:cheater00 at gmail.com>> wrote:
>     > There's a new gamer keyboard from wooting.nl <http://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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