MATRIXSYNTH


Thursday, March 20, 2025

Spectral Audio Neptune 2 - Analog Rackmount Monosynth SN 50174

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

"The Neptune 2 is a Swiss-made, all-analog mono-synth with built-in MIDI and CV/Gate in a 2-space rack-mount module. It features three true analog oscillators for a very fat sound. It has a 24 dB filter, but it is not as creamy as a Minimoog. All parameters and controls are available from the knobs and switches on the front panel in an intuitive and clearly labeled layout - bringing old-school analog synthesis to the modern MIDI studio.

These don’t appear very often. Not many were produced.

Look closely at the front panel in the photos. There are many features that don't appear on most monosynths. Most important: two ADSR envelopes, with modulation positive or negative for the filter. The filter offers Low Pass and High Pass modes. Oscillator 3 is a bass oscillator, or it functions as an LFO, with several waveforms and mod destinations (Targets). There is also MIDI control of filter and aftertouch modes."

Moog Source Monophonic Analog Synthesizer (Serviced w/ New Membrane Panel) SN 2840

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

Additional SYNTH CITY Listings

"Recently serviced with a new membrane panel and fully recapped power supply, tuned and calibrated for optimal performance. Wonderful sounding and functioning Moog Source!"

It was previously listed without the new membrane back in 2023 here.

1972 Moog MuSonics Sonic V Super Rare Synth #96/100 Made

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

You can find a video covering the Sonic V previously posted here.

"Super-rare Moog MuSonics Sonic V synthesizer from 1972! This is #96 out of only 100 made and the only one I’ve seen with a front panel overlay that differs slightly than others I’ve seen (which, admittedly, is not many and not at all in-person). It’s actually more in the aesthetic style of a VI, as far as that particular detail is concerned.

The elusive predecessor to the Sonic VI was designed by Gene Zumchak, who also designed the 960 Sequencer, 961, and 962 modules. According to advertising literature, it was “designed for the music educator” and features “ring modulation, microtonal keyboard scaling, two-note keyboard capability, and extended modulation resources”.

The sounds this thing can make are absolutely insane. For those of you who are in to noise, sound effects, and sound design — this is a formidable and wildly entertaining beast. It is capable of some really beautiful, melodic sounds, as well, so it’s not just for pure craziness. It’s a unique instrument not often seen out in the wild and only in the collection of distinguished collectors, studios, and synth aficionados. A rare chance to grab an incredibly rare instrument!

Just serviced with the following:

- PSU recap
- all pots cleaned and a few jacks replaced
- ground hum eliminated
- 741 op-amp replaced in Oscillator A
- full calibration"

EML 200 and 300 Blue Face

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

"Not something you see everyday! EML Electrocomp 200 with 300 controller.

These predate the more popular Electrocomp 101, starting the run in 1969. The blue faced ones were all made for universities, so I’ve been told. I don’t know a whole lot about the lineage here, but suffice to say these are extremely rare. The last complete sale I can find on Reverb was 6 years ago.

The units show pretty typical wear for instruments made nearly 60 years ago, but they’re in remarkably good condition. Everything works! A couple of the triggers on the 300 double trigger when tapped, and I would imagine the whole thing would benefit greatly from a cleaning.

Like I said, these are incredibly rare. So it’s difficult to even put a value on it."

Korg PS-3100 Polyphonic Synthesizer

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

ARP 2600P Monophonic Analog Semi-Modular Synthesizer with 3604-P Keyboard SN 11309

Note: Auction links are affiliate links for which the site may be compensated.


via this Reverb listing

1621 Sequencer pictured below, separately listed here.

"ARP 2600 from 1976/77

4072 filter (but manufactured just before ARP changed to the orange/black livery in 1977)

Early ARP/Tonus 3604-P keyboard

Original Owner's Manual

Original keyboard cable

Original power cable

External transformer from 230V to 110V included

A bunch of professionally made patch cables with the correct Switchdraft Tini-Jax 0.141" plugs, color coded by length

2x 6.3mm to Tini-Jax 0.141" cables

Newly serviced and calibrated, fully functioning and sounds absolutely gorgeous.

Cosmetically in very good condition except for a few details (see pictures)."

LinnDrum LM-1 Drum Computer



via this Reverb listing

"Linn Drum LM1/LM-1 Original Drum Computer 1980"

Pic of the inside below.

Control Synthesis Deep Bass 9 Acid Techno Jam with Nord Drum and Novation Circuit


video upload by Waiting For Zyo

"Time to get some basslines from my Control Synthesis Deep Bass Nine, an analog bassline synthesizer from 1994. It comes with a single oscillator switchable between saw, square, and none (for audio input processing) and a few basic controls like tuning, cutoff, resonance, filter envelope, decay, accent, and volume.
Made as a clone of the TB-303, it fails to emulate the iconic synth but has its own character, with deep basses and squelchy resonance. I created some classic bassline sequences with the Novation Circuit (where velocity engages a filter opening in the Deep Bass Nine), a lead line using the internal synth (with a custom preset), and used the four drum parts to control the Nord Drum.

The result is a techno tune with a pulsing bassline and a wannabe acid flavor. :D Enjoy!"

Digitakt II & Digitone II OS 1.10 Upgrade


video upload by Elektron

"Double OS delight is coming to the Digi IIs! Digitakt II and Digitone II are both leveling up to version 1.10, sharing a bunch of features while picking up some fresh new tricks along the way. Let’s dive into some of the standouts, but be sure to check the release notes for a full feature list.

Digitakt II is receiving the Comb+ filter from Digitone II, adding this metallic flavor to your filter options. Mono sampling makes its return, joining stereo sampling and offering greater flexibility when capturing sound. Routable overdrive distortion and base-width filter now lets you decide whether they come before or after your various filter alternatives. Keytrack modulation also jumps over from Digitakt II’s younger sibling.

Digitone II brings Chord Mode on board, more powerful than ever, and with various modes and Chord Memory to maximize your harmonic flexibility. Overbridge streaming is now possible, allowing multi-track audio streaming straight to your computer (the rest of Overbridge for Digitone II is in beta testing and coming soon). You can also do lots more with the Arpeggiator, rotating the offsets for new melodic sequences as well as gaining new arp speeds to experiment with.

There’s lots more too! Find out more and download: https://bit.ly/41ulpGo"

Digitone II OS 1.10 Video Guide


Digitakt II OS 1.10 Video Guide

How to Set-up and Use Motion Recorder on Roto-Control MIDI Controller with Elektron Syntakt


video upload by Melbourne Instruments

"Roto-Control is a motorized MIDI controller for software and hardware. Roto-Control can extend the creative capabilities of synths, drum machines and any compatible MIDI hardware or software in MIDI Mode. In this video we show you how to set-up and pair Roto-Control (in MIDI Mode) with an Elektron Syntakt, and how to use the Motion Recorder as a performance enhancing tool. We show how easy it is for Roto-Control to MIDI learn and map 8 mutes and 8 different parameters from the Syntakt to Roto-Control's buttons and knobs. This method can be applied when using Roto-Control with other Elektron devices.

🎛️ Here are key steps to setting up both devices:
1. Connect Roto-Control MIDI Out to Syntakt MIDI In, and Roto-Control MIDI In to Syntakt MIDI Out, via 2 different MIDI cables.
2. Choose MIDI Mode on the Roto-Control.
3. Check Syntakt settings page and sub menus:
• Settings - MIDI Config - Port Config - Encoder Dest INT + EXT
• Settings - MIDI Config - Port Config - Receive CC/NRPN
• Settings - MIDI Config - Sync - Clock Send and Transport Send
4. Map Syntakt parameters to Roto-Control buttons and knobs:
• Press LEARN on the Roto-Control and select the knob or button want to assign. The LEARN button will flash and the MENU window will display what knob or button you have selected.
• On the Syntakt move or press the button you want to control. Roto-Control's display will immediately display the MIDI channel and MIDI CC.
• Press LEARN to confirm and exit.
The default labels on Roto-Control will display the MIDI channel and CC value as "CH:xx/CC:xx". Further customization of controls can be done with the Roto-Setup App - change labels and colors that reflect parameters on the Syntakt.

🖥️ Download the Roto-Control Syntakt MIDI Setup used in this video here, import it and try it with your Roto-Control: https://tinyurl.com/483cbnbx

Motion Recorder:
Check the Motion Recorder settings on the Roto-Control. We want to synchronize the Motion Recorder and playback from the Syntakt as the the master clock. In MIDI Mode, press FUNC and select MIDI EXT CLK for external clock. Also select Motion Recorder length on the same page, in this video we are using 64 steps. Press FUNC to confirm and exit.

⚡️HOT TIP: On the Roto-Control or the Roto-Setup App change the minimum and maximum values via the MIN VALUE and MAX VALUE for the button mutes. MIN Value = 0 and MAX Value = 1, this will ensure fast bidirectional muting between the Roto-Control and the Syntakt.

Roto-Control is a motorized MIDI controller for software and hardware. Roto-Control brings Melbourne Instruments' motorized technology to a MIDI controller in a powerful, portable, affordable tool for studio and live applications.

Unlike anything seen before, rethink software and hardware interactions via fully assignable motorized touch-sensitive knobs, user definable haptics for detailed control, high-res screens providing easy-to-read labels for every control, and internal memory with storage for thousands of assignments. Powerful, compact, and portable, Roto-Control features three main modes of operation: MIX, PLUGIN and MIDI with Motion Recorder."
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