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

[Dan Snazelle]

ok

the more i read this explanation, the more i start to get it, but i am still a little fuzzy on a few things. I think what you are saying is
 that i need to have a shift register 
(not sure of how many stages would work for this...)
i plug the CV OUT of the CV source (Or switches) into the SHIFT REGISTER DATA IN
the clock in of the shift register comes from the gate? each gate will tell the shift register to start loading again? and while the gate is still ON it will keep
holding the current (CV) data?

i do not get what the LFO does though (and you said the LFO is the same as the keyboard envelope?)

now mark was saying to use switches. so each switch would turn on a voltage? but what about a gate?



going to get out some data sheets.

thanks





________________________________
> 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
>
>>> Synth-diy at dropmix.xs4all.nl
>
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
>
> _______________________________________________
>
> Synth-diy mailing list
>
> Synth-diy at dropmix.xs4all.nl
>
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
>
>
> --
> hohum