#1370

^ i uploaded the video to youtube demonstrating the pitch oddity. it’s a bit milder than i thought it was, but you should be able to hear a slight drop in pitch every time i press the loop-freeze buttons. mild enough for some to not care, but it bugs me when i’m trying to stack up melodic lines and the two loopers keep going in and out of tune with each other as i freeze the tracks.
do any of y’all’s do the same thing? or is mine a runt unit.

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#1371

It’s almost certainly the battery. 9v as opposed to the recommended 12v PSU is going to change the behavior.

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#1372

I’ve never experienced anything like that - I do always use a PSU though.

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#1373

thanks for weighing in on the pitch/freeze issue. i’m hoping it’s a battery issue as has been suggested. i don’t have a psu for it yet, but when one arrives, hopefully it won’t (mis)behave the way it has been.

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#1374

Made a Node guide for the Rungling Paper Circuit as well as my PCB’s.

RUNGLING PINOUTS
RUNGLING PINOUTS2048×1497 363 KB

rungling.tif (4.7 MB)

^ Included the Tif for the original Paper Circuit.

Some Rungling Patches - Hyper Techno :smiley:

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#1375

Thought I might share a track I made with my homemade 3, 4, 5, 6 rollz, a physically manipulated cassette tape and a DIY norns shield

Also as a bonus, I used that track to figure out how to glitch mp3 files to get some (subjectively) nice digital artifacts

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Lo fi techniques
#1376
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#1377

anyone have any suggestions for using the xlr input on the coco 2? I have a shure sm57 running into it and can only hear it when recording/sounds super quiet with all the gain knobs turned full cw. not sure if that’s normal behavior or not as I’ve only used the stereo ins before.

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#1378

And you’re patching the XLR’s white banana into a side or two of the Coco (green)? Coco input level knob turned up? I use that same mic and I have plenty of gain.

#1379

New version of this mockup.

Also wanted to point out a few mods I found that can be done to the paper circuit itself I haven’t seen mentioned before.

timbre modifications

timbre mod gerassic organ
timbre mod gerassic organ802×688 93.6 KB

audio examples (note that 3rd one is a little high pitched and loud. I left volume the same so you could hear the difference with just the capacitor move:

master pitch modifications

master pitch mod gerassic organ (2)
master pitch mod gerassic organ (2)802×688 94.6 KB

here I’m just sweeping the full range of the B2M pot I have in place of the resistor so you can hear the pitch (and volume) differences). The second part I am showing the “vibrato” at the end (by just touching the two legs of the pot with my finger to short them. In my version I will probably have a small resistor or trimmer in series for this so that the vibrato amount is constant, need to do some experimenting there. Note I don’t think the pitch is necessarily linear to the resistance value, so a log or anti-log pot may be a better control, but I don’t have either currently, so I can’t experiment.

12 Likes
#1380

I experience the same with a Sennheiser MD-21u. I have to dime everything just to get it loud enough. I think it works better when powered at 12V vs 9V, but it’s hard to say yet. Still lots to learn, I guess.

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#1381

was able to get it gain staged as expected last night by running audio out of coco into norns. usually I run norns into the stereo ins and have my headphones in the stereo out but I guess the xlr doesn’t like that.

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#1382

So you’re saying that when you plug the output of the cocoquantus into another device and monitor from there, the audio from the mic input comes through better?

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#1383

yup - I can’t explain it. just got home and ran it through my modular which worked as well. still no luck with stereo out to my headphones but I’ll keep messing with it. xlr > 3.5mm > piezo in might work just as well too.

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#1384

Thank you for sharing these! I’ll give timbre mods a try when I get back to town :slight_smile:

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#1385

sweet! let me know how it works out for you.

One other thing I forgot to post. Some of these paper circuit chips are discontinued in through-hole but are available in SMD. For the gerassic organ, this was the 4067. I first tried a chip from ebay. It’s not marked “TI” (tho the picture showed it would be)…it may have worked (and I burned it out)…or it may have never worked, not sure. I grabbed this adapter https://protosupplies.com/product/pcb-soic-tssop-24-to-dip-adapter/ and some of the SMD 4067’s available on mouser (I’ve learned most of the letters afterward indicate the packaging…important if you are a PNP machine, but not so much if you are a human soldering it). And it works great (in the breadboard, I’m pretty sure it’d be fine on the paper circuit or soldered into a pcb too)

2 Likes
#1386

I built my first Gerassic Organ on paper with a 4067 from eBay and it works fine (I think I have one or two spares if anyone need one), didn’t check if it was marked “TI” or not though.
I also have a second one, it is a “Gerassic soul”, a small pcb with smt 4067 and 3 LFOS (CD40106) to trigger it, someone on the ciat lombarde cool kids group sold a few of them a year (or two) ago. I never really finished the build, should get back to it and add some of your mods, could be a nice instrument :slight_smile: (also have a spare “gerassic soul” pcb with 4067 pre-soldered if someone wants it).

2 Likes
#1387

a little exploration of the esoterica spikering - left side is following pugix build, the other is a revision with 472 caps in place of 103’s in the strange symbols thing

7 mins standalone, then using a dounle knot for triggers and square wave input

6 Likes
#1388

seriously awesome! In this config (and based on some of the sounds) it kind of reminds me of the landscape stereo field

#1389

Hey there,
I’ve been stoked to see all the things folks have been coming up with for the paper circuits, thanks for sharing your progress! I would be into playing around with the gate trigger mod if you eventually draw a schemo for it.
Just testing a double gerassic over here as well, but I have a question or two-
Has anyone noticed a click or thump (in the audio out) when buttons are pressed/released?
Both of the organs I made do this, but unreliably - sometimes there is no click-thump, sometimes there is. It definitely happens more often when more than one button is pressed simultaneously. I have swapped out several different types of buttons in an effort to perhaps minimize this, which sort of made a difference, but did not eliminate the clickthump. Anyhow, is this a thing anyone else hears with their organs? Just for reference, they are built with the mlogger pcbs. And heres a pic for eyeballing.

IMG_20200806_141024644
IMG_20200806_1410246443264×1391 732 KB

7 Likes