DDSR

anadeji · Post by **anadeji** » Thu Jun 28, 2018 3:03 pm

cannot wait for this! great work as ever Tom!

chrisdermo · Post by **chrisdermo** » Fri Jun 29, 2018 7:45 am

Can the gate outputs be stacked on inputs ok or should we use a mixer?

BugBrand · Post by **BugBrand** » Fri Jun 29, 2018 7:58 am

Yes, all gate outputs now have diodes for passive OR'ing --- though, of course, if you are taking an output to more than one destination you'll have to be careful with the summing because it'll affect all joined parts (does that mouthful make sense?!)

chrisdermo · Post by **chrisdermo** » Fri Jun 29, 2018 8:23 am

BugBrand wrote:Yes, all gate outputs now have diodes for passive OR'ing --- though, of course, if you are taking an output to more than one destination you'll have to be careful with the summing because it'll affect all joined parts (does that mouthful make sense?!)

Yep totally made sense! I have my little DIY diode panel to avoid that if I need it.

/\/\/\/ · Post by **/\/\/\/** » Fri Jun 29, 2018 12:10 pm

How are the gates triggered? Are all gates constant amplitude?

BugBrand · Post by **BugBrand** » Fri Jun 29, 2018 2:14 pm

The gates are taps from the shift-reg 'conveyor belt' - they're 10V, active when the corresponding step is active.

BugBrand · Post by **BugBrand** » Thu Jul 05, 2018 10:27 am

Found another 'longer pattern' method - using Recirc AND feeding the other tap back into the Data input [ie. this is just done within one side of the DDSR]. Just make sure the tap & recirc lengths aren't the same. This option should have been obvious to me before - it is a very basic form of digital noise generation techniques (would be better with 3 or 4 times longer shift reg)

I also wanted to document the previous Long repeat I mentioned:
Clock both sides with the same clock.
Set a Recirc Pattern on the Left one (eg. 8 length)
Take the Tap from that side over to the data input on the right register.
Now, with the right reg XOR switch set to LO you'll get a following (but independent) pattern - so you can select a different tap compared with the original on the left.
Or if you set XOR to Recirc you get the long repeats - a setting of 7 will give 14 bars (of 8), while 6 will give 6 bars (I think that's right).

Hard to explain it all! Might do more vids sometime. Of course, I also need to do a product listing and instructions sometime, but think that playing is one of the best ways to get the feel!

chrisdermo · Post by **chrisdermo** » Thu Jul 05, 2018 10:34 am

BugBrand wrote:Found another 'longer pattern' method - using Recirc AND feeding the other tap back into the Data input [ie. this is just done within one side of the DDSR]. Just make sure the tap & recirc lengths aren't the same. This option should have been obvious to me before - it is a very basic form of digital noise generation techniques (would be better with 3 or 4 times longer shift reg)

I also wanted to document the previous Long repeat I mentioned:
Clock both sides with the same clock.
Set a Recirc Pattern on the Left one (eg. 8 length)
Take the Tap from that side over to the data input on the right register.
Now, with the right reg XOR switch set to LO you'll get a following (but independent) pattern - so you can select a different tap compared with the original on the left.
Or if you set XOR to Recirc you get the long repeats - a setting of 7 will give 14 bars (of 8), while 6 will give 6 bars (I think that's right).

Hard to explain it all! Might do more vids sometime. Of course, I also need to do a product listing and instructions sometime, but think that playing is one of the best ways to get the feel!

I'm going to try this out tonight! I think i've done both of these before but a big part of the fun of playing is that the D/A outs can be fed to so many things that it can often become quite difficult to follow how many beats or bars before a repeat for all the lovely cross modulation! I'll take it back to simples to try these out.

chrisdermo · Post by **chrisdermo** » Fri Jul 06, 2018 3:26 am

Got 30mins to myself last night to try out the long repeats patches. Seriously awesome stuff, with the dual method there's so much performability in simply switching the pattern length and xor between lo and recirc on the second register...... let alone changing the cycling bits on the first. Blew my mind!

rowsbywoof · Post by **rowsbywoof** » Fri Jul 06, 2018 3:32 am

Can’t wait for these to show up in the store. Sounds like proper fun.

BugBrand · Post by **BugBrand** » Fri Jul 06, 2018 3:41 am

rowsbywoof wrote:Can’t wait for these to show up in the store. Sounds like proper fun.

They're unlikely to for the moment - but I've got some available for people with frame space.

chrisdermo · Post by **chrisdermo** » Mon Jul 09, 2018 5:48 am

Some very crappily recorded (phone mic) clips with the grille on drumming duties and DDSR on getting wild duties!

Lots to explore with this combo, going to try again for a proper video as soon as it's not a million degrees in my flat!

a100user · Post by **a100user** » Mon Jul 09, 2018 5:57 am

I missed the postman on Saturday so it'll have to wait until later in the week :(

BugBrand · Post by **BugBrand** » Thu Jul 12, 2018 6:09 am

Another fun patch to try::::

Audio rate clock.
Set XOR switch to Recirc.
- the Recirc Tap then gives audio rate divisions.
- listen to a Gate output for squarewave, or take a D-to-A for something a bit more harmonic.
Now - plug a sub-audio gate (eg. clock division or rhythm) into the Data input. Each time a gate occurs it kind of re-seeds the D-to-A waveform.

The results are very nice! It can sometimes sound slightly vocally even.

Will try to do a demo vid or recording later.

T. Jervell · Post by **T. Jervell** » Thu Jul 12, 2018 8:16 am

Wanted to try this out, so made a quick and dirty video. I hope Tom will make a better one, as I just did this 5 minutes before I had to drive my children to the beach.....
Oh and BTW, the Chirper osc are hardwired to the DDSR’s inputs via the bud hence, no patch cables...

I also mix in osc 2 and the filter after a while. All driven by the DDSR.
[video][/video]

k_bntzn · Post by **k_bntzn** » Thu Jul 12, 2018 5:29 pm

Thanks for the patch tips Tom, will have a go at this patch tomorrow.

Trond, how are the ddsr hardwired to the chirper? Maybe i will have to look into this someday soon.

T. Jervell · Post by **T. Jervell** » Fri Jul 13, 2018 2:25 am

sungja wrote:Thanks for the patch tips Tom, will have a go at this patch tomorrow.

Trond, how are the ddsr hardwired to the chirper? Maybe i will have to look into this someday soon.

You’ll have to ask Tom. It was his idea, and he also did the wiring.

chrisdermo · Post by **chrisdermo** » Fri Jul 13, 2018 7:35 am

sungja wrote:Thanks for the patch tips Tom, will have a go at this patch tomorrow.

Trond, how are the ddsr hardwired to the chirper? Maybe i will have to look into this someday soon.

The DDSR has 'bus' clock inputs on the back that are associated with the switch bus/off/ext (clock input jack) on the front panel. Shouldn't be too hard to wire up.

BugBrand · Post by **BugBrand** » Fri Jul 13, 2018 8:07 am

New thread for such details....
(but needs pics!)

DickMarker · Post by **DickMarker** » Fri Jul 13, 2018 4:35 pm

Just got one - thanks Tom.

It's been a while since I last had one, I had forgotten how inscrutable shift registers can be - this weird quality that appears almost random but you know they're working on some logic you haven't quite figured out yet!

Really fascinating alongside the Synthvoice with it's rota of quite standard, familiar modules and then you chuck this crazy cat amongst the pigeons. The audio rate patch mentioned above is great.

BugBrand · Post by **BugBrand** » Sat Jul 14, 2018 2:18 am

Thanks Mark & this is good to hear!
I absolutely agree on the play fight that is their behaviour - this module has a balance of understanding and surprise which is something I really like in electronic music systems.

Still need to kick myself to do another vid!

radams · Post by **radams** » Sat Jul 14, 2018 12:14 pm

Will the DDSR do “arabesque “ patterns in a similar way that the Serge ASR does?

BananaPlug · Post by **BananaPlug** » Sat Jul 14, 2018 1:34 pm

It's not the same idea. An ASR has multiple delayed-by-one outputs of the input. But these shifters derive A/D outputs based only on which bits are set. You can mess with the bits or you can let them recirculate unchanged. The D/A outputs will change accordingly and compared to ASR, that's a more indirect way to generate CVs. It's not random, but it's abstract enough for serendipity to be part of the charm.

radams · Post by **radams** » Sat Jul 14, 2018 2:03 pm

BananaPlug wrote:It's not the same idea. An ASR has multiple delayed-by-one outputs of the input. But these shifters derive A/D outputs based only on which bits are set. You can mess with the bits or you can let them recirculate unchanged. The D/A outputs will change accordingly and compared to ASR, that's a more indirect way to generate CVs. It's not random, but it's abstract enough for serendipity to be part of the charm.

Thanks for the info

BugBrand · Post by **BugBrand** » Mon Jul 16, 2018 4:02 am

Yeah, the D-to-A is kind of a bonus generation from the Digital Shift Register.

Both types of shift register is like a chain of buckets (yep, BBD-ish) where each time a clock occurs, the contents gets passed along the chain, but:
Digi-shift - each stage can either be on or off
Analogue-Shift-Register - each stage can be any voltage - they're all Sample & Holds.

A dual quantizer would go very nicely with the DDSR! Imagine triggering them with different taps and feeding them with different D-to-A signals... Don't get me tempted! (what I really want to do is a dual Sonic Potions Penrose - sometime....)

MOD WIGGLER

MOD WIGGLER

DDSR