[sdiy] MIDI velocity

[Scott Young]

Just slap a quantiser on it and play everything as if it was is in the key of C!

> On 25 Apr 2016, at 03:11, Terry Shultz <thx1138 at earthlink.net> wrote:
> 
> Just in key of c and all will be equal
> 
> Heh heh
> 
> Terry
> 
> Sent from my iPhone
> 
> On Apr 24, 2016, at 2:04 PM, P Maddox <yo at vacoloco.net <mailto:yo at vacoloco.net>> wrote:
> 
>> Yup, same here...
>> 
>> black keys seem 'quicker' than the white keys
>> 
>> On 24 April 2016 at 18:04, Amos <controlvoltage at gmail.com <mailto:controlvoltage at gmail.com>> wrote:
>> I'm curious to hear if others have noted significantly different switch timing (relative to actual played velocity) for black keys versus white keys, on those Fatar keybeds.  
>> 
>> My experience is that the black keys seem "hotter" than the white keys, enough that I have to use separate curves for black versus white to get consistent-feeling MIDI velocity output.  I chalked it up to geometry and physics and went about my way, but I didn't notice any similar comments so far in this thread so I thought I'd ask if it was just me experiencing this...
>> 
>> -Amos
>> 
>> On Wed, Apr 13, 2016 at 9:24 PM, <rsdio at audiobanshee.com <mailto:rsdio at audiobanshee.com>> wrote:
>> 
>> On Apr 13, 2016, at 12:20 PM, Neil Johnson <neil.johnson71 at gmail.com <mailto:neil.johnson71 at gmail.com>> wrote:
>> > I wrote:
>> >
>> >> About 7 years ago when I was writing the keyboard scanning code for a
>> >> Siel Opera 6 I had a simple scheme for scanning and measuring play and
>> >> release velocity (not many folks seem to know about release velocity
>> >> although some synthesizers do recognise it).
>> >>
>> >> Using an Atmel ATMega8 scanning the entire keyboard every 1ms I run
>> >> 4-state state machine for each key, where the states are UP,
>> >> GOINGDOWN, DOWN, GOINGUP, and an 8-bit counter for each key.
>> >> Debouncing is handled by the algorithm rather than a separate
>> >> debouncing step.  With the right encoding of the states you can do
>> >> most of the testing and state transitions using btiwise operations, 8
>> >> keys at a time (on a 32-bit processor you could do 32 keys at a time).
>> >>
>> >> I'll try and dig out the code and sling it up on github sometime.
>> >> It's all in C, no assembler required.
>> >
>> > Found it, and hosted up on github:
>> >
>> > https://github.com/nejohnson/kbdscan <https://github.com/nejohnson/kbdscan>
>> >
>> > The keyboard scanner talks to a 74LS154 on the keyboard assembly, and
>> > generates key on and off events with associated velocities.  There's
>> > also code for reading some analogue inputs and a footswitch, but
>> > that's not important right now.
>> 
>> Thanks for sharing this!
>> 
>> I was going to suggest that having the 'LS154 on the keyboard assembly is a great design choice, because that allows a simple, 14-pin connector, but then I realized you probably were stuck with that choice because of how the Siel Opera 6 was designed. Sure enough, looking at the schematic I see 8 row bits, 4 column address bits, power and ground. (feel free to swap the row and column nomenclature as you prefer - Roland seems to use the opposite terms)
>> 
>> Brian
>> 
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