Virtual Lunetta in Pure Data

pemdasi

Hello all. I've been doing preliminary work on building a lunetta after lurking on this forums for a while.

I wanted to make a realistic simulation based on how I understand the theory currently. I did this in vanilla pure data, an open source graphical patching programing language. Every thing in the simulation is treated as a 5v signal, including ramp up/down times on the waveforms of the logic.

LFO Module:
Manual control Slider/Pot
3 Selectable Frequency Ranges
PW manual control

R2R Ladder:
4 Bit DAC, implemented with signals in pd-vanilla

VCO:
3 Selectable Frequency Ranges
PWM

I used 4 LFOs into the 4-bit R2R and fed that to a VCO in the attached mp3.

Since I haven't built this device, I'm not exactly sure that it will operate with similar charachteristics. Interested to know if you think this sounds like a reasonable approximation of a similar hardware setup.

Edit: I tried to attach the pure data file, but the forum disallows *.pd. The file is attached, just rename it to .pd.

Here's a screenshot of the patch, it's really a block diagram of modules.

virutal-lunetta-1.jpg

Description:

Screenshot of the interface to the virutal lunetta in pd

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31.58 KB

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puredata_lunetta_drone_demo.mp3

Description:

Simulated Lunetta

Download

Filename:

puredata_lunetta_drone_demo.mp3

Filesize:

3.89 MB

Downloaded:

805 Time(s)

lunetta-4c-1r2r-1vco.txt

Description:

pd file, rename

Download

Filename:

lunetta-4c-1r2r-1vco.txt

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14.38 KB

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RF · Posted: Sun Apr 10, 2011 6:23 pm Post subject:

Yup

I think you've got it - that sounds fairly familiar.
Time to solder some hardware

bruce

tjookum · Posted: Sun Apr 10, 2011 11:53 pm Post subject:

very good job, it sounds very similar to my ears and my ears have heard quite a lot of lunetta abuse Smile

.

But there is no substitute for the real deal, I bet you can't stick a led in there somewhere or use a starvepot Wink

pemdasi · Posted: Wed Apr 13, 2011 12:08 am Post subject:

I have completed moving these objects over to external patches. I also have a working emulation of a 4011 chip, now. Shouldn't be that hard to emulate the other chips in pd. At some point I will make available a library of these objects for others to use if there is interest.

http://soundcloud.com/pemdasi/pemdasi-vlunetta-demo-4-13
This clip contains two chains of 2 VCOs and LFOs going into a 4011 feeding another VCO. The two final stage VCOs are then panned in the stereo field via a sin LFO.

All frequencies are manually controlled for exploration purposes Smile

ufokult · Joined: May 20, 2013 Posts: 9 Location: Finland

Sorry for the necrobump, but... Did you ever make more chips for this? I was about to begin building similar stuff in Synthedit, but if someone already made it, then why bother? It would be nice to prototype Lunetta stuff virtually.

-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

Seems like there was slight rejection by the 'purists' out there in 'Lunettaland'. Laughing

I can't see why. Maybe it makes their suffering with a hot soldering iron all seem in vain.

Lunettas may be dirty, but they are far from cheap. The hardware will keep you living in poverty for years. Logic is logic. This looks like a good alternative to me.

analog_backlash · Posted: Fri Jun 07, 2013 5:08 am Post subject:

ufokult · Joined: May 20, 2013 Posts: 9 Location: Finland

commathe · Posted: Sat Sep 21, 2013 8:55 pm Post subject:

This is very cool, I had been trying something similar in Max/MSP but I was more interested in emulating boolean sequencers and the like