[sdiy] A different kind of polyphonic aftertouch

[Mike HEQX]

As we see in the Ensoniq SQ-80 there is no physical switch. It was a 
change in inductance that was being measured and they did have a rubber 
pad under the key and they did give you polyphonic aftertouch ( not 
related I know ). So they used inductance, and someone else uses light, 
and yet another uses capacitance, and these are all linear sort-of 
systems that in my opinion are better than the two switch method of 
generating a psuedo-velocity sensitivity that measures time.

So really the majority of synth keybeds that claim velocity sensitivity 
are really just sensing attack velocity. Some offer a choice of attack 
curve, which is artificially generated for you. Very few are actual 
hammer actions ( in the piano paradigm ), and very few are doing 
anything unique. Long live linear sensing!




On 1/4/2018 2:36 PM, cheater00 cheater00 wrote:
> You put a spring or piece of rubber under the key and suddenly the
> linear sensor is a pressure sensor.
>
> On Thu, Dec 14, 2017 at 6:46 PM, ASSI <Stromeko at nexgo.de> wrote:
>> On Thursday, December 14, 2017 5:09:40 PM CET MTG wrote:
>>> https://deskthority.net/wiki/Adomax_Flaretech
>>>
>>> "There are no electronics in the switch modules themselves. Instead,
>>> surface-mounted infra-red optoelectronic components on the circuit board
>>> provide the sensing in conjunction with a prism in the module's
>>> transparent slider."
>> So a vertical mouse, sort-of.  Which means it's very likely measuring key
>> travel rather than pressure, which is a lot less useful for a musical
>> keyboard.
>>
>>
>> Regards,
>> Achim.
>> --
>> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
>>
>> Samples for the Waldorf Blofeld:
>> http://Synth.Stromeko.net/Downloads.html#BlofeldSamplesExtra
>>
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