Re: [AH] totally insane!! system 700 sequencer

From David Moylan
Sent Fri, Jul 11th 2008, 19:14

Sounds like you need a voltage controlled one-shot.  Probably easy 
enough to build with a 555 timer.  Any manufacturers have such a thing 
out there?

Dave

James Husted wrote:
> What I would find more useful is to have a variable gate time for each 
> step instead (or along with) the variable step time. To be able to 
> adjust the step's note length within the step (and not changing the 
> total sequence time) would be a very useful thing to me.
> -James
> 
> 
> On Jul 11, 2008, at 9:28 AM, alt-mode wrote:
> 
>> Ah OK, that's what I thought you meant.  Of course, the main feature 
>> of the
>> System 700 sequencer in this respect is rotary switches that can 
>> change the
>> timing accurately on the fly.  A switch and a pulse divider might be 
>> easier
>> to work with.  This would also be true for the comparison to the SAM-16
>> sequencer that Gene mentioned; switching from 1/8th to 1/16th quickly and
>> accurately is tough with a continuous knob.
>>
>> I guess no single step sequencer will ever have all of the features 
>> possible
>> but it is cool that each seem to have their own quirks and personality 
>> that
>> make them unique!
>>
>>     Eric
>>
>> On 7/11/08 11:13 AM, "charles graef" <redacted@example.com> 
>> wrote:
>>
>>> Yup -- sorry, I phrased it badly.  When you clock from an external 
>>> VCLFO you
>>> can modulate the frequency of said VCLFO with the CV out from one of the
>>> sequencer rows and thus modulate the duration of any given step.  For
>>> example, in theory if the CVs in the row were
>>>
>>> 0v | 1v | 1v | 0v | 1v | 1v | 0v | 1v | 1v | 0v | 1v | 1v
>>>
>>> the rhtymn of the output would be
>>>
>>> 1/4 | 1/8 | 1/8 | 1/4 | 1/8 | 1/8 | 1/4 | 1/8 | 1/8 | 1/4 | 1/8 | 1/8.
>>>
>>> An octave is a doubling of frequency and you're working 1v/oct.  If the
>>> clock goes twice as fast, the duration of the step is 1/2 as long.  Etc.
>>>
>>> --Chuck
>>>
>>>
>>> -----Original Message-----
>>> From: alt-mode [mailto:ah@alt-mode.com]
>>> Sent: Friday, July 11, 2008 10:11 AM
>>> To: charles graef; 'analogue'
>>> Subject: Re: [AH] totally insane!! system 700 sequencer
>>>
>>> On 7/11/08 9:39 AM, "charles graef" <redacted@example.com> 
>>> wrote:
>>>
>>>> The Doepfer sequencer allows the CV or audio input to individual steps.
>>> The
>>>> Analogue Systems sequencer has skip.  Would be nice if every 
>>>> sequencer had
>>>> everything.
>>>>
>>> Very true!
>>>
>>>> Re the Roland, I should think it would be possible when using an 
>>>> external
>>> VC
>>>> clock with a row of sequencer CV and thereby halve a given step 
>>>> duration
>>>> with an octave increase in CV from that row, quarter the duration 
>>>> with a
>>>> 2-octave increase, etc.
>>>
>>> OK, I don't think I parsed that.  Are you saying that you can use the 
>>> CVs
>>> from a row to modulate the clock rate and thereby achieve the timing 
>>> changes
>>> that are possible with the per step switches?  Please elaborate.
>>>
>>>     Eric
>>>
>>>
>>>
>>
>>
> 
>