There is a good discussion of Lunetta's on the Electro-Music.com website in the DIY Forum.
Each module is essentially a CMOS chip with a minimal support circuit - inputs and outputs taken directly to the front panel jacks.
Mainly CMOS Counters, Inverters, Shift Registers and Logic.
The first one I built is shown above.
* Quad 40106 Osc with starve pots, synch and ext power inputs.
* Dual 40106 Osc with starve pot and ext power input
* 4094 Shift register
* Dual 4015 Shift register
* 4024 Divider/Sub Osc.
* 4051 CV generator
* 4051 Pulse Pattern generator
* Passive 3 input mixer
* 4011 Ring Mod
* 4011 NAND gate
* 555 VCO
* Six 40106 Osc with two voltage control inputs
* 6 input R/2R Ladder
* 4017 Pulse Divider/Sub Osc
* Simple Portamento
* Passive tone control
* 1/4 inch outputs
* Built in 110 volt power supply
These are patched together to create sounds.
Here are a couple early sound samples. The first sound sample I manipulate a couple toggle switches, and is just a collection of interesting sounds it made. The second one is 'hands off' - just doing its own thing.
Lunetta Noise Sample
Lunetta Version 2.0
Lunetta Free Jazz Noodle 1
Lunetta Version 2.0
I traded my first Lunetta away - and started another one in Late February, 2009.
For Version 2.0 I kept those circuits I found useful, added a couple new ones and some features I thought would be nice. The Luntetta Forum on EM
has picked up a few more participants and the ideas are flowing!
Version 2.0 is not a modular design - I built up the individual circuits on perfboard and packaged it in a re-tasked aluminium 'Bud' box.
It was a tight fit.
Here's what I ended up with...
6 40106 Oscillators / Clocks
2 4094 shift registers
4024 Sub Osc/Freq Divider
4089 Freq. divider
4 XOR gates 4030
2 4024 Ripple Counter
2 4015 Shift Register
4516 Up/Down counter
4017/4051 Pattern & Melody generator
4051 Melody Generator
2 40106 VCO
2 555 VCO
4 input Dual mono audio mixer w/ line out
Stereo Headphone amp
Stereo Audio amp and small internal speakers
Built in AC Power supply
Here's what it does...
There are about 125 jacks, nearly a dozen pots and 60 or so LEDS. A modular design is much easier to work with when wiring the panel, and repairing IC's... I won't try an 'all-in-one' design for any other Lunetta
Sound Lab Ultimate Keyboard Synth