[sdiy] DIY 32-note pedal-boards

[Edward King]

QTC= Quantum Tunnel Composite

Its a way of creating a substance that changes resistence depending on 
pressure. Essentially, small channels are crafted into the material during 
manufacture.

go to www.peratech.co.uk for more information.

I personally wouldnt use QTC to facilitate velocity sensing (if thats what 
you meant). I would use optical arrangement (optical sensors or even 
interuptors and transistor output sensors). The QTC pills are fine for 
aftertouch however.

It doesnt matter if there is variance from one key to the next, because 
ideally you should map the analogue output of each key inside a pic or 
microprocessor. All you need to do is write in some diag code so that when 
you enter diag mode, you press each of the keys / pedals once and the mpu / 
mcu maps from initial value to final value for each key and maps 
accordingly.

the QTC will withstand a phenomenal compression. Just make sure that 
whatever is compressing the pill is flatish so that distribution is 
reasonably equal. A sharp edge or pointed object will damage them. I found 
felt to do the job nicely.

Alternatively, qtc cable is a very quick and easy way of achieving basic 
aftertouch.

EK

----- Original Message ----- 
From: "GRAHAM ATKINS" <gatkins at blueyonder.co.uk>
To: "Andre Majorel" <aym-htnys at teaser.fr>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, October 21, 2007 10:32 PM
Subject: Re: [sdiy] DIY 32-note pedal-boards


> To the uninitiated....what are these QTC pills please ?.
>
> Graham
> On Oct 21, 2007, at 20:23, Andre Majorel wrote:
>
>> On 2007-10-21 20:19 +0200, JH. wrote:
>>
>>> I've bought a simple Midi pedal (just 1 Octave) on ebay last
>>> year.  Telling from his other auction, the guy who sold it is
>>> buying pedal boards from all kinds of used organs, and puts his
>>> Midi electronics in, and then sells the whole thing for a very
>>> affordable price.
>>
>> Pity to cannibalise an instrument like that but realistically,
>> it's going to end in a landfill anyway.
>>
>> QTC pills would go well with a pedal board, wouldn't you think ?
>> Fine control of the pressure might prove challenging, though.
>> Perhaps placing the pills near the axis, where the travel is small
>> enough would work.
>>
>>> I love it. Even though I'm by no means a skilled pedal player,
>>> it's so handy to use your foot if you just want to choose a new
>>> bass note for a drone, instead of occupying a hand with this, or
>>> using clothespins in Schulze-like manner.
>>> I have that pedal permanently hooked up to my rackmount Minimoog
>>> clone.
>>
>> Some folks have the patience and the talent to compose one part at
>> a time. Having neither, I prefer to have everything at hand (or
>> foot) and let the tape roll.
>>
>> -- 
>> André Majorel <URL:http://www.teaser.fr/~amajorel/>
>> Do not use this account for regular correspondence.
>> See the URL above for contact information.
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>
>
>
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