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Analog Shift Register
MUFF WIGGLER Forum Index -> Eurorack Modules Goto page Previous  1, 2, 3, 4, 5, 6  Next [all]
Author Analog Shift Register

microfauna

oskies wrote:
curious - maybe we have the order of the switching different (polarity of the short deyay?). Here, it's 8,7,6,5,4,3,2 in rapid succession, then resting at 1.

I trigger maths ch4 to get a quick decay, and use the EOC to trigger renee, otherways I just get 0123 stages asr.

I wonder if Dieter knew about this patch when he christened the A152 - how did you come up with this?


What I'm calling stage 1 is an unshifted sample of the cv at the ASR input at the time of the clock. Are you calling that stage 0?

I think how I'm calling the stages is causing the confusion. Maybe I've got it wrong. I thought that is what it means on the Elby ASR, Quantimator etc. Maybe someone can clarify that.


So my patch is for 1 sample of the cv on the clock and 3 shifted.


The switching is 8,7,6,5,4,3,2, resting on 1

As I said the idea of the patching came from taking elements of the A-148 x4 patch using the switching to replicate the cascading of ins and outs and your quad comparator patch and trying to make that work with the A-152.

Doepfer call it an ASR on the module page because there is faux ASR patch described, which is nothing like this one, and which only works for one specific ASR patch ie VCOs xn with the same sound and the same tuning.


oskies

And for those that want to understand this patch, here are my notes (so I can find them back later lol )

For patch, see picture.

Essential idea is that by using a short decaying pulse to the CV, you activate the 152 stages in rapid succession (8765432 and rest at 1).

If you trigger the pulse, ASRin is stored at th5, which acts as ASR out 1, and
at the same time, th5 is moved to th2, where it is waiting for the next pulse.

Second pulse: new input is stored at th5, and th2 is moved to th6 - this is then ASR out 2. Etc. The signals run around in circles...


oskies

Microfauna wrote: What I'm calling stage 1 is an unshifted sample of the cv at the ASR input at the time of the clock. Are you calling that stage 0?

Yes, and I think calling that stage one is perfectly fine. What I should have said, if you want to get the max nr of delays steps from a sequence, then the relative timing of the seq and asr matters - so the way I do it, stage 0 of the asr is already one step behind, and so the last stage of the asr is precisely 4 steps behind - see the earlier o'toole screenshot.

By now, I think we have out-nerded most fellow wigglers. I'm gonna see if I can come up with even more crazy 152 patches. I also sort of have the suspicion that by using maybe one additional module, we may turn this into an 8 stage shifter zombie

It's on!


microfauna

oskies wrote:

stage 0 of the asr is already one step behind, and so the last stage of the asr is precisely 4 steps behind - see the earlier o'toole screenshot.


I can't see the screenshot only embed data. Is that just me?

Maybe you could add a note on your info diagram about which are the ASR in and the 4 outs.


oskies

will try to update notes and fix missing attachment later this weekend.

Using one extra module and some luck, I just got a full 7 (EDIT: not 8 - for that you probably need the S/H mod for the a152) stage asr from the 152. Details to follow, but maybe others want to solve this puzzle first spinning


udbhav

This thread has served to confirm my sneaking suspicion that the A-152 should be my next purchase.

Such an amazingly flexible module, had a much harder time wrapping my head around it when I first got into modular synthesis.


microfauna

OK oskies let's be having you

A-152 + 2 modules for a 7 stage (1 + 6 shifted) is the best I can do.

The patch requires A-152, VCO (preferably with hard sync), VC switch (A-150, Malekko Switch etc) and some stackables.

The VCO is used to clock the A-152 at audio rate and the VC switch starts and stops this clocking, starting at step1 and stopping at step 8. It uses a similar technique of using the switching to cascade the ins and outs of the T&Hs.

A-152
Addr. ccw
Common Switches In/Out to Common T&H Input

SW I/O to T&H Outs
Use stackables for the stages that you want to use ASR outs
1-2
2-3
3-4
4-5
5-6
6-7
7-8

SW I/O 8 - ASR In
T&H Outs 1,2,3,4,5,6,7 - ASR Outs1,2,3,4,5,6,7

VCO set at medium frequency
VCO square to A-150 I/O1. This is the input which is selected when there is no CV going to the cv in.
A-152 Dig. Out 8 to A-150 cv in
Trigger for ASR to A-150 I/O2 and sync of VCO

Adjust the frequency of the VCO so that it clocks the A-152 without a noticeable delay between the ASR outs but samples reliably. There is a balance to be struck. Due to limitations of how quickly the A-152 can sample and switch, you will find that if you clock it too quickly the higher voltages won’t be sampled properly. This is becomes more noticable for the higher stages of the ASR as the voltages get shifted along.

There other ways of doing the patch using other modules to clock the A-152 (e.g. looping VCS) and to replace the VC switch (e.g logic modules).


microfauna

A-152 7 stage ASR in action
[s]http://soundcloud.com/microfauna-uk/hocketandphase[/s]


milkshake

@microfauna: Thanks, learned a lot.
thumbs up


oskies

Hi Microfauna,

exactly, thats the way I do it too. I was going to post the patch but you beat me too it.

To generate the burst of 8 clock pulses that you need to step the asr forward, and to make sure it starts out that the correct stage, I use a little additional trick:

I use a Peg to generate the burst of clockpulse that are needed (but you can use a switch also, or a LFO that can hold like the E355). For the peg: let it run at high rate (for example feeding it first some quick pulses), and connect EOF to clock in of the 152.

Connect Dig out of step 8 of the A152 to the async in of your peg. To trigger a step of the ASR, send a reset to the A152. The 152 goes to step 1, so digi out 8 goes low, allowing the PEG (or LFO with hold) to run, until stage 8 is reached, after which the PEG stops running and the ASR has set one step. Is a cool trick to generate bursts - maybe there are smarter ways.

In any case: the A152 can act as a 7 stage ASR. Would be good if all threads have such a happy end!

Finally, if you do the SH mod for the A152, I'm pretty sure it can do 8 stage ASR.


wellurban

This thread is magnificent, and has made me even gladder that I've bought an A152. I knew I wanted it for the multiplexer & gate outs, and I had an inkling that the addressed T&H section should be able to do some amazing things, but I couldn't quite work out what. Now I just can't wait for it to arrive so that I can try these amazing patches! w00t


mig27

microfauna & oskies, you guys rock.
Tipping my hat!


wmbb

This thread is a little confusing. There seems to be an underlying theme that, except for the quantimator, the world is still waiting for an ASR (probably digital) that works.

So my question is simply: --- Is the readily available Elby ASR satisfactory for holding a voltage for a second or two or is it not?

And by "satisfactory," I mean no perceptible droop in voltage when use for 1 v/oct applications after a second or two . For example, the Serge ASR is completely satisfactory for my purposes.


analogue01

I think the Elby ASR is probably fine (at least from what I can gather here), but it's a very deep module and wont fit in a lot of cases. At least, that's why I don't have one.

wmbb wrote:
This thread is a little confusing. There seems to be an underlying theme that, except for the quantimator, the world is still waiting for an ASR (probably digital) that works.

So my question is simply: --- Is the readily available Elby ASR satisfactory for holding a voltage for a second or two or is it not?

And by "satisfactory," I mean no perceptible droop in voltage when use for 1 v/oct applications after a second or two . For example, the Serge ASR is completely satisfactory for my purposes.



paults

The upcoming (in Feb) E102 will hold voltages accurate to 14-bits as long as power is applied. And, unlike any ASR before, has VC'd delay between each output stage (it "counts clocks", either internal or external).

The last test pcbs are at the PO in my mailbox, will solder them up on Black Friday.

Skiff friendly, too (about 30mm deep).


lordofthebored

wmbb wrote:


So my question is simply: --- Is the readily available Elby ASR satisfactory for holding a voltage for a second or two or is it not?



Here's a demo to address your question:

ASR demo

Sorry, can't figure out soundcloud embed right now


wmbb

lordofthebored wrote:
wmbb wrote:


So my question is simply: --- Is the readily available Elby ASR satisfactory for holding a voltage for a second or two or is it not?



Here's a demo to address your question:

ASR demo

Sorry, can't figure out soundcloud embed right now


Wow, that is just TERRIBLE! At first I didn't realize the same sequence was supposed to be repeating.

And I was fixing to order 2.

I hope someone else has a different experience or that yours was not factory assembled or something...


VortexRanger

Here's a 3-oscillator fuguesque hmmm..... piece using the Elby ASR. I've never noticed any significant pitch droop with it.

[s]http://soundcloud.com/vortex-ranger/shift-registry[/s]


lordofthebored

wmbb wrote:

Wow, that is just TERRIBLE! At first I didn't realize the same sequence was supposed to be repeating.

And I was fixing to order 2.

I hope someone else has a different experience or that yours was not factory assembled or something...


It's not a sequence! That's a triangle lfo in the cv input and a square lfo in the clock in. the result is a series of random notes, all 2-4 seconds in duration.


Dr. Sketch-n-Etch

That soundclip sounds fine to me. I redesigned the CGS ASR circuit, not to eliminate droop (which probably isn't a problem) but to eliminate the DC squishing-and-shifting circuitry, which can introduce error in the voltage outputs. Really, all I did was replace the CD4052 switches with DG409. These can handle a broader voltage range (44Vpp vs 15Vpp) and therefore don't require this error-prone circuitry.


wmbb

Yeah, sorry. I guess I didn't know what I was supposed to be hearing, what with the random and all :-) Glad to hear it.


wbuttler

wmbb wrote:

So my question is simply: --- Is the readily available Elby ASR satisfactory for holding a voltage for a second or two or is it not?


I just finished building the Elby kit recently. Works fine, no audible sign of droop or any other artefacts. About the only gripe (minor) that I have is that the sockets are a bit loose for my patch leads. Otherwise, does what it says on the tin and works great as an extension to my Quantimator.


haima

I'm very happy with my Elby kit too - no noticeable droop - those DG analog switch ICs do the trick.

It's a great companion to my uScale and a156 quantizers thumbs up

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