simple PAIA keyboard scanner/arpeggiator (was Re: [sdiy] trying to understand appregiators in late 70's synths)

[Dan Snazelle]

i would love to have access to these pages!!



Digging through the files, this arpeggiator option is described in 
Simonton's 'Friendly Stories about Computers/Synthesizers' on pages 
8-13.

--------------------------------------------
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http://www.myspace.com/lossnyc  


http://www.soundclick.com/lossnyc.htm


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> Date: Thu, 8 Jan 2009 21:24:40 -0800
> From: dlmanley at sonic.net
> CC: synth-diy at dropmix.xs4all.nl
> Subject: simple PAIA keyboard scanner/arpeggiator (was Re: [sdiy] trying to	understand appregiators in  late 70's synths)
> 
> Dave Manley wrote:
>> Florian Anwander wrote:
>>> Hi Dan
>>>
>>>> forgive for being an idiot, but how can i incorporate this into an 
>>>> arppregiator?
>>> Yep. your doubts aren't wrong. This keyboard is only the first step, but
>>> it delivers a key as digital 6-bit word. This has to be 'postproduced'
>>> somehow.
>>>
>>>> due to my lack of german...is it a mono keyboard?
>>> Hmm, yes and no. If you'd put a D/A direct behind the Latch then it
>>> would be monophonic and would always send the highest note.
>>>
>>> But one might add further logic to make it polyphonic and need this for
>>> the arpeggiator too. I am only brainstorming (as far as there is any
>>> brain to storm inside my old head ;-)) to the mail client now...: e.g.
>>> for eight voices you need eight latches. The trigger from the 4051 must
>>> be advanced with each new pressed note to the next latch. But then I am
>>> not sure how to act on, if more than eight keys are pressed.
>>>
>>
>> Years and years ago, there was a Paia keyboard scanner circuit that 
>> you could use as a simple arpeggiator (IIRC) by controlling the scan 
>> clock. Normally, the scan clock was running so the entire keyboard was 
>> being scanned every ~1 ms.  In this mode the scan clock was stopped 
>> when a depressed key was found, and then re-enabled based on the 
>> arppegiator rate.  As it scanned the keyboard from low to high, it 
>> would output the digital code for each currently depressed key, pause, 
>> and then go to the next key.  It looks like the elektor circuit could 
>> probably do the same with some mods.  If you get a little clever, you 
>> could probably change the direction of scanning for up or down 
>> arpeggios (and if really clever up/down or random).  I think this was 
>> described in one of John Simonton's lab notes when he started 
>> introducing the digital keyboard/computer/quash/etc.
>>
>> -Dave
>>
>>
> Digging through the files, this arpeggiator option is described in 
> Simonton's 'Friendly Stories about Computers/Synthesizers' on pages 
> 8-13.  These were scanned by Anders Sponton, and at some point I grabbed 
> a copy.  I can't find them with "The Google" - does anyone have a link?  
> If not, and someone is interested I can make them available.
> 
> BTW, the pause circuit is even simpler than a 555. It is an RC.
> 
> -Dave
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