From James Husted Sent Fri, Jul 11th 2008, 20:43
From James Husted Sent Fri, Jul 11th 2008, 20:43
Another way is to use a clock that also provides a sawtooth and use a level detector/comparator circuit to compare against the knob row to make the gate as long as the value reached by the sawtooth wave = variable gate. -James On Jul 11, 2008, at 10:14 AM, David Moylan wrote: > 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" >>> <xxxxxxxxxxxx@xxxxxxxxxxxx.xxx> 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:xx@xxx-xxxx.xxx] >>>> 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" >>>> <xxxxxxxxxxxx@xxxxxxxxxxxx.xxx> 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 >>>> >>>> >>>> >>>> >>> >>> >>> > >