[sdiy] trying to understand appregiators in late 70's synths

[mark verbos]

The problem, it seems to me, would be that a CV input isn't enough to  
interface with it. It would need a built in keyboard, or MIDI input.

What about a module with one octave of toggle switches on the panel,  
that you engage and it arpeggiates those? up/down, several octaves as  
an option...

mark



On Jan 4, 2009, at 12:56 AM, Dan Snazelle wrote:

>
> notime...thanks the idea about shift registers sounds really  
> interesting.
> i am all for weird and odd (even monophonic) ideas....
>
>
>
>
>
> --------------------------------------------
> check out various dan music at:
>
> http://www.myspace.com/lossnyc
>
>
> http://www.soundclick.com/lossnyc.htm
>
>
> http://www.indie911.com/dan-snazelle
> (or for techno) http://www.myspace.com/snazelle
>
>
>
>
>
>
> ________________________________
>> Date: Sat, 3 Jan 2009 18:53:37 -0800
>> From: djhohum at gmail.com
>> To: subjectivity at hotmail.com
>> Subject: Re: [sdiy] trying to understand appregiators in late 70's  
>> synths
>> CC: dougt55 at yahoo.com; synth-diy at dropmix.xs4all.nl
>>
>> If you want it to work in the traditional sense, that is, the  
>> arpeggiator plays the keys that you are holding down at any point  
>> in time then there is really no practical away around using a  
>> microprocessor. I'm aware of duophonic CV keyboards but not more  
>> than that. You have to know which keys are being held down to know  
>> which notes to play. That means having one CV output for each key  
>> that is currently being held down as well as a signal to indicate  
>> that it's being held down
>>
>>
>> Now, if you're willing to discard the traditional user interface  
>> and settle for something like "the arpegiator plays the last three  
>> notes played in round robin" then you can do it without the  
>> software. Simply use the trigger to gate the CV into an analog  
>> shift register. This will have three (or four, or however many  
>> notes you want to play) stages with individual outputs. Use the  
>> gate to enable playback, this forces you to play legato, but allows  
>> this primitive interface. The playback module is nothing more than  
>> a traditional step sequencer that selects a voltage from the shift  
>> register ouputs. The arp plays while the gate is held down. Very  
>> primitive, but it could work, after a fashion.
>>
>>
>> You might just use trigger to select between where the next input  
>> to the shift register is loaded from as well. That is, trigger  
>> causes the register stage to load the CV value from the keyboard CV  
>> whereas an absence of trigger causes it to load from the ouput of  
>> the shift register. Again, gate just enables the playback which is  
>> the shift register reloading values at a rate determined by an lfo.  
>> The lfo is also the output gate signal for the synth envelope. So,  
>> when you strike a key the the next loaded value is the key your  
>> playing and that replaces whatever is currently in the ouput stage,  
>> holding the key down causes the notes to be cycled in turn.
>>
>>
>>
>> On Sat, Jan 3, 2009 at 6:28 PM, Dan Snazelle> wrote:
>>
>>
>>
>> it's not that i am set on NON midi or on MIDI
>>
>>
>>
>> or even that i am set on mimicking anything
>>
>>
>>
>> i just want to figure out how the heck to do it!!
>>
>>
>>
>> i dont really see the need for it to be midi based though.
>>
>>
>>
>> i am more interested in an appregiator that puts out gate and cv  
>> natively and then i could use some other machine to convert that  
>> INTO midi i guess.
>>
>>
>>
>>
>>
>>
>>
>> if there is no way to do it without software than i might give up  
>> for a little while at least. i had hoped it could be done
>>
>> with cmos. but this might push me to learn how to use some kind of  
>> software device. i have thought about learning what the hell
>>
>> all these pics and microcontrollers can do for awhile BUT i just  
>> dont need one MORE interest that takes all my time right now. :)
>>
>>
>>
>> thanks guys
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --------------------------------------------
>>
>> check out various dan music at:
>>
>>
>>
>> http://www.myspace.com/lossnyc
>>
>>
>>
>>
>>
>> http://www.soundclick.com/lossnyc.htm
>>
>>
>>
>>
>>
>> http://www.indie911.com/dan-snazelle
>>
>> (or for techno) http://www.myspace.com/snazelle
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ----------------------------------------
>>
>>> Date: Sat, 3 Jan 2009 18:09:40 -0800
>>
>>> From: dougt55 at yahoo.com
>>
>>> Subject: Re: [sdiy] trying to understand appregiators in late 70's  
>>> synths
>>
>>> To: synth-diy at dropmix.xs4all.nl; subjectivity at hotmail.com
>>
>>>
>>
>>> The ultimate arpeggiator is the Europa Jupiter-6. Check out all  
>>> the features here -
>>
>>> http://www.synthcom.com/Europa/support/EuropaUserGuideV1.0.pdf
>>
>>>
>>
>>> I think the earliest synth with an arpeggiator was the Jupiter-4  
>>> in 1979. Anyone know of one earlier?
>>
>>>
>>
>>> Doug
>>
>>>
>>
>>> --- On Sat, 1/3/09, Dan Snazelle wrote:
>>
>>>
>>
>>>> From: Dan Snazelle
>>
>>>> Subject: [sdiy] trying to understand appregiators in late 70's  
>>>> synths
>>
>>>> To: "sdiy"
>>
>>>> Date: Saturday, January 3, 2009, 1:59 PM
>>
>>>> for a long long time i have wanted to be able to understand
>>
>>>> appregiators.
>>
>>>> only recently have i started worrying that without
>>
>>>> understanding some programming, i will never have an
>>
>>>> appregiator.
>>
>>>>
>>
>>>> so it was with great interest that i began looking at some
>>
>>>> old shematics for ideas last week...jupiters,
>>
>>>> junos.etc///till i realized that i understood almost none of
>>
>>>> what was going on
>>
>>>> as it was working with a CPU
>>
>>>>
>>
>>>>
>>
>>>> so...to make a long story short. WHAT is a realtively
>>
>>>> simple schematic to look at to TRY to understand synths with
>>
>>>> appregiators?
>>
>>>>
>>
>>>>
>>
>>>>
>>
>>>>
>>
>>>>
>>
>>>> i suppose the problem is made worse due to the face that
>>
>>>> without seeing what is PROGRAMMED on the CPU....well maybe
>>
>>>> this is a useless exercise.
>>
>>>>
>>
>>>> i do really dream of having an appregiators for my synths
>>
>>>> though.
>>
>>>>
>>
>>>>
>>
>>>> thanks
>>
>>>>
>>
>>>>
>>
>>>>
>>
>>>> _______________________________________________
>>
>>>> Synth-diy mailing list
>>
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>>
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>>
>>
>>
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>>
>>
>>
>> --
>> hohum
>
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