[sdiy] Make a CS80

[cheater cheater]

I think that it would be nice to have both a proximity/position sensor
(hall?) for reading how far the key is depressed, and a pressure
sensor at the end of the travel, followed by a final high-pressure
tactile switch that presses in when the pressure sensor is at the
maximum.. that could make for some interesting playing techniques

For example you could control a pan flute sound, and the position
sensor could fade in more 'breath' as you're depressing the key. Once
the key touches the pressure sensor (which could have a metallic
terminal with a matching terminal on the key body to tell when the key
is there) the resonance could start happening and the pressure would
control the crossfade between the breathy sound (making it decay to
30% at maximum pressure) and the resonance (making it raise to 100%).
Then the tactile switch would completely decay the breathy sound to 0,
via a 15ms release time.

Or you could have a violin style sound where the string gets bowed
when you're depressing the key, then the pressure heightens the
vibrato, and the tact key plucks it and the sound is over; this could
be used by quick-handed players to have control between
bowing/staccato/pizzicato.

This scheme doesn't even exclude the additional information of
velocity, but definitely gives it a new context, and it could be used
for something else yet to give even more expression to the sound..

Had only MIDI not happened, we'd have hundreds of synths like that
since the 80s.

Cheers
D.

On Mon, Apr 5, 2010 at 11:45, Tom Wiltshire <tom at electricdruid.net> wrote:
> I've been wondering about Quantum Tunnelling Compound for polyphonic
> aftertouch.
>
> You'd mount a small pill of QTC under each key, sat on top of a PCB with
> 'fingers' etched on it. A microcontroller could then read the resistances of
> all the pills and report back to the voices. It's fairly strightforward, but
> I haven't tried it yet.
>
> T.
>
> http://www.mutr.co.uk/product_info.php?products_id=1144
> http://www.discountelectronicsstore.co.uk/electronic_supplies/quantum-tunnelling-compound-pills-qtc-pills/
> http://www.peratech.com/index.php
>
> On 4 Apr 2010, at 23:45, cheater cheater wrote:
>
>> aaand has someone said polyphonic aftertouch?
>> http://content.honeywell.com/sensing/sensotec/loadcell.asp
>
>