D-Lab Electronics Classic Multi-Plexer

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via this auction

See the D-Labs label at the bottom of this post for previous posts including audio demos. The following description if from the auction:

"This is the D-Lab Multiplexer (also known as Classic Multi-Plexer).
This is a wavefom synth box that is really cool, and very difficult to find.

Unlike many similar synth boxes, the Multi-Plexer has an input, not just an output, so it can be used with other guitar pedals or other synth modules, or maybe even a microphone!

I used it with guitar signal input, and also used it with other synth modules in front of it (such as the BBS module in my other auction). Fun to experiment with other pedals in the chain, like bitcrushers, octave, fuzz, delay etc. It likes to see a fairly strong guitar signal.

It's pretty difficult to explain what it sounds like, but there is a synth signal with depth and sustain that interacts with the input signal, and there is also a modulation effect with rate and frequency. It's like there's a phaser and a pulse effect hiding in there.

In my experience the Multi-Plexer was useful for adding some lower frequencies and overtones to other synths placed in front of it. It gave a whole new dimension to the BBS synth.

The only thing I don't like about this pedal is that when you turn the power off it does not pass signal.
To get around this problem I used a true bypass looper to engage and disengage it.

I had a "synth pedalboard" going built with a handful of wacky pedals that I am selling now.
I decided to part it out only because I need the cash.
This pedal has been tested and is in good working condition.

Pedal has moderate wear, some scratches and scrapes in the faceplate and finish,
most notably a ding just beneath the Rate knob on the edge.

Includes original manual, and RCA Y to 1/4" cable (originally included), I guess this is for using the Multi-Plexer with turntables, MP3 players and the like? I never used or tested the cable, but it looks like it should work just fine.
Uses 2 9V batteries for operation. Has a power toggle to preserve battery power."

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D-Lab Multi Plexer Synthesizer

via this auction

"Bought this for the strange sounds it makes for recording. Used only a few times. D-Lab makes all sorts of items and this is hand-made and works on 2 9 volt batteries. Great shape and works perfectly. With the instruction sheet it originally came with."

see this post for some more info on the D-Lab Multi Plexer including some samples.

D-Lab Electronics Multi Plexer

images via this auction

Details:
"GETLOFI.Com
The Multi-Plexer will produce those famous sounds that you grew up hearing on Lost and Space, The Forbidden Planet, Star Trek and other Sci-Fi classics. The name was assigned, simply because that’s what it does. The circuit sends an analog signal around in a circle, bending and distorting it, like a ring modulator. However, the MP is a FREE RUNNING Synth. No input is required for it to operate. But if you input a signal (like your guitar) it will ride the MP self generated wave. The end product is a result of many manipulations. I cannot describe its sounds in words. Please listen to the links and judge for yourself.

Multi-Plexer.MP3
Multi-Plexer.MP3
Multi-Plexer.Wav

Circuit:
The circuit is a basic pure Analog Synth (not noisy digital) with Depth, Sustain, Impact, Rate, Frequency and Volume adjustments. Only TOP Quality components were utilized. “Spared no expense” The circuit board was custom manufactured using a photo-etch system. It runs on 2- 9vdc batteries (included). Totally isolated circuit will not produce hum or ground loops on your Guitar amp or stereo as other plug in the wall synths do. This is a great gadget to add to your rock band as a creepy, self running, sound generator. It’s also a lot of fun to just play with on your home stereo. This device runs at a low frequency, therefore, it responds well to Bass guitars and keyboard inputs. It's initial design was intended for generation of neat sound effects. The input jack came later.

Check out the MP3 files that my friend in OK sent me (see links above). The original circuit was developed in the 1970’s. 30 of them have sold on the ebay so far. See my feedback for great comments on this device. This gadget is not available anywhere besides D-Lab. In other words, you will be getting a very unique item. My investment per unit is $70.00 (parts), excluding numerous hours of layout and construction time. The cost have elevated due to the cosmetic upgrades. I am doing my best to provide a top notch product. I realize that my gadget is small league compared to the big hitters (Moog, Paia & Korg). I just hope that you enjoy it. Bands around the country have been e-mailing me with great reports incorporating the Multi-Plexer's weird sound into their gigs. This device is great for Band Background weird noise or making your instrument act crazy!

This device is intended for fun or interface with your band equipment, not for development of a new Outer Limits episode. The cost is much less than store bought models and it is fully portable, unlike anything else on the market. Please e-mail me with questions or concerns before bidding. Unit comes with a nifty overview sheet for operating this crazy instrument."

D-Lab Multi-Plexer

Click here for more shots via this auction

Details:
"The D-Lab Classic Multi-Plexer in Baked ON-Dark Metallic Blue

I have had request’s to keep the unit simple for those that enjoy the sound and liked the original look, this unit is it! with a few updates:
1. New design Main circuit board (just received this week!)
2. New FREQ range pot (for better response).
3. Blue Metallic Bezel paint and Yellow LEDS. For a bit of 1970’s style.
4. Overview sheet.

Found this website write-up on my device! I guess they share synth technology.

GETLOFI.Com

The Multi-Plexer will produce those famous sounds that you grew up hearing on Lost and Space, The Forbidden Planet, Star Trek and other Sci-Fi classics. The name was assigned, simply because that’s what it does. The circuit sends an analog signal around in a circle, bending and distorting it, like a ring modulator. However, the MP is a FREE RUNNING Synth. No input is required for it to operate. But if you input a signal (like your guitar) it will ride the MP self generated wave. The end product is a result of many manipulations. I cannot describe its sounds in words. Please listen to the links and judge for yourself.

Multi-Plexer.MP3
Multi-Plexer.MP3
Multi-Plexer.Wav

Circuit:
The circuit is a basic pure Analog Synth (not noisy digital) with Depth, Sustain, Impact, Rate, Frequency and Volume adjustments. Only TOP Quality components were utilized. “Spared no expense” Runs on 2- 9vdc batteries (included). Totally isolated circuit will not produce hum or ground loops on your Guitar amp or stereo as other plug in the wall synths do. This is a great gadget to add to your rock band as a creepy, self running, sound generator. It’s also a lot of fun to just play with on your home stereo. Works best with Bass guitars or Keyboards, since the frequency is basically low.

Check out the MP3 files that my friend in OK sent me (see links above). The original circuit was developed in the 1970’s. Over 60 of them have sold on the ebay so far. See my feedback for great comments on this device. This gadget is not available anywhere besides D-Lab. In other words, you will be getting a very unique item. My investment per unit is $70.00 (parts), excluding numerous hours of layout and construction time. The cost have elevated due to the cosmetics I have been incorporating, plus quality components. I am doing my best to provide a top notch product. I realize that my gadget is small league compared to the big hitters (Moog, Paia & Korg). I just hope that you enjoy it. Bands around the country have been e-mailing me with great reports incorporating the Multi-Plexer's weird sound into their gigs.

This device is intended for fun or interface with your band equipment, not for development of a new Outer Limits episode. The cost is much less than store bought models and it is fully portable, unlike anything else on the market. Please e-mail me with questions or concerns before bidding. Unit comes with a nifty overview sheet for operating this crazy instrument. I can accept PayPal or M/O’s only. Payment must be received within 5 days of auction end. Shipping will be via Fed X ground ($9.00) to a street address, NO P.O. boxes. Thanks for looking and for your consideration.

NOTE: GREAT HALLOWEEN Sound effects device! Last one till 1 Nov."