#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.

2 Likes
#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.

1 Like
#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?

1 Like
#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.

1 Like
#1384

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

1 Like
#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
#1390

first of all, those sliders are so cool!

I’ve noticed click/thump-iness at high x resistance, as well as when the 0 note goes past audio range. note my bread board is really different on the button side of things though so I don’t know what might be causing it there.

Here is the schematic/simulator for the gate in.

you just do 3 of these and connect where there’s “TP” in the simulator to the bottom pad of the buttons. you don’t need anything at the top pad of the buttons (that’s +v)

2 Likes
#1391

Thanks, yeah the sliders are fun to use fer sure.
I just got another handful of buttons that seem to have a springier, less clicky “action” to them, and will swap them in and see if that helps, I am hearing the clickthump at all decay (x) settings, so… we’ll see i guess.

Also thanks for the link to the simulator, missed that one earlier in the thread.

1 Like
#1392

The other thing you could maybe try is a “switch bounce filter”…no idea if it will make a difference but there’s a bunch of very simple circuits you can find from googling and it might be worth seeing if it helps.

1 Like
#1393

Some Cocoquantus action here on this free album for everyone. It was recorded entirely live and you can read the notes accompanying the release. Hope you might enjoy it :slight_smile :blush:

15 Likes
#1394

A question for Tocante owners. I’ve been on the verge of finally buying one for a while but i’m not sure which is for me, there aren’t a lot of recordings/demos out there, and Peter’s explanations are beautifully and uniquely Peter.

I think i’m interested in either a Phashi or Zenert. I want to use it fairly unconventionally, as a kind of lead instrument, and create howling broken-glass sax type sounds. The Zenert reminds me of some of those extended-technique type sounds, but i’m worried it won’t be able to hold much of a melody when i do want to tame it back. The Phashi seems like an all round excellent choice, but maybe it’s not quite nasty enough for my needs.

I’m in Australia, so no opportunity to try before I buy. I regret running out of time/not getting to visit Patch Point when I was in Berlin this time last year.

2 Likes
#1395

Phashi is the tamest and Zenert is the noisiest of them all.

Karp and Thyris are my favourites. Karp can easily go from sweet strings to black metal to glitch, I think the most versatile but hard to play with fatter fingers. Thyris has more of a massive horn sound and can be bent from elegant to beast mode in a very expressive manner. Reading your description you might be looking for a thyris, because phashi doesn’t make a good lead among other instruments imo.

5 Likes
#1396

So the Red Bananas on the 2-Roll LFO x8 that I designed work perfect for sending CV into Modular, whilst the Brown Jacks allow for inter-patching to create rhythmic CV Pulses. :smiley:

#1397

This is so good - thank you for sharing.

2 Likes