Probably no other monophonic analog synth has this amount of sound bending capabilities at your fingertips on an ultra-compact footprint. Directly prepatched and switchable are:
VCO2 synchable to VCO1 VCO3 can modulate either VCO2 (only) or VCO1 + 2 VCO3 can modulate the filter VCO3 can be taken out of the audio path completely, becoming an 'invisible' source for modulation only the filter envelope (VCF) can modulare VCO2 ('sweep VCO') VCF has two modes of keytracking both LFOs can control VCOs AND filter cutoff at the same time and with independent settings LFO1 can do S&H by sampling LFO2 (making them interdependent) or the noise generator oh, there actually is an "OSC4" which is white noise (with its own level control), in addition to the white noise setting on VCO3 and the white noise setting on LFO2. That's 3 noise generators in just one synth. glide function VCA switchable positive / negative envelope trigger switch ... In addition, there are the patch points which add PWM modulation, external audio insert points, individual VCO outs, V-gate in on LFO1 +++
Condition: Fully functional. Great overall cosmetic condition. Very few signs of use. Some hairline scratches around the sides, particularly the front. Hardly visible – see photos.
In Europe, this comes with a 12V AC 1A adapter (EU-style plug – 230V). Not switchable! Will NOT include in North America / Japan sales to save on shipping weight. You'll need to buy one that works at your local voltages."
Googlish translation on condition from the listing:
"The instrument really looks like new, a real museum piece with a legendary history.
About 500 pieces were produced worldwide, it is rumored there are currently about 50 copies left in the world."
"A one-take jam with the Novation Summit in split mode.
Whipping something quick with a latched arp on part B and messing around with notes on part A. There may need to be a longer part 2 as there's some fun to be had with the onboard effects and mod matrix. Despite just scratching the surface, I love how easy and quick it is to drum up great sounds on this synth.
As always, the goal with multiple synths on this channel is to see how each instrument sounds with the other and to improve my key and programming chops. With that in mind... there is minimal processing of these sounds. There's no compression or EQ on this piece."
"I recently posted an unboxing video of this MIDI theremin [posted here] so I decided to pair it with my Mopho and create a track. NOTE: I put all the patch bank/numbers on the screen. However, I have the Mopho Keyboard patches loaded on my Mopho module so they may be slightly different than a factory Mopho."
"Just got this 1979 Modular module, the Dual Sequential Switch and am having a blast! Here's just a simple yet effective fun patch to feature the Mode settings. Enjoy!
Bidirectional sequential switches for audio and CV
The DSS is intended as a companion for the Buchla 245/246 sequencers and other "quad" modules in Buchla format such as the 281 and 292. New possibilities for performance and composition arise from the ability to dynamically route multiple sources to multiple destinations without repatching.
BUILD OPTIONS. Choose from one of three build options. See the images above for illustrations of each build type. On the standard build the main I/O uses Tinijax on the top half and banana jacks on the bottom half. Custom builds with all Tinijax or all banana jacks for the main I/O are also available. If you want a custom build, please send an email with your build preference after placing your order. If no preference is stated your module will be supplied as a standard build.
The main I/O is bidirectional, meaning that the module works as a 4:1 multiplexer or a 1:4 demultiplexer. Patch up to four signals to the inputs labeled 1-4 and they will be sequentially routed to the common I/O jack. Alternately, patch one signal source to the I/O jack and it will be sequentially distributed to the 1-4 jacks.
Each half of the module has its own independent loop length (from 1 to 4 steps) and sequencing mode: forwards, backwards, forwards and then backwards (pendulum), or random. The SC (Step Change) output generates a trigger whenever the sequence length is changed, which is useful for synchronizing the upper and lower halves of the module or communicating state changes to other modules. The analog CV addressing input (ADDR) bypasses pulse-based control and allows an external CV source to select which step is active, similar to the "analog" CV input on the Buchla 245/246.
These extensive control and sequencing options make the DSS one of the most fully-featured sequential switches available in any modular format. Every aspect of the switching schema is accessible, facilitating previously inaccessible patching opportunities.
Tech Specs
4:1 or 1:4 sequential switches for audio or CV
Variable sequence length (1-4 steps) with voltage control
Variable switching mode (forward, reverse, pendulum, random) with voltage control
VC step addressing via clock, direct selection, or external 0-10V CV
Extensive pulse I/O for synchronization with external modules
Extra Settings
RESET/TRIG switch toggle. By default, pressing the RESET switch returns the sequencer to step 1, but this switch can also be used as a manual trigger source. Press RESET for 5 seconds to toggle this setting. The SC LED will blink to confirm the change. Now when the switch is pressed the TRIG jack will be pulsed instead. The RESET and TRIG jacks still work independently. Press RESET again for 5 seconds to toggle the switch function back to a manual reset.
Manual step selection. Press the RESET switch and then turn the STEPS knob for manual channel selection. This works like the ADDR CV input but doesn't require external CV. Note that all trigger inputs (RESET, TRIG, and the four SELECT jacks) can still change which channel is active so this feature works best when those inputs are not being used.
Pendulum behavior. Press the RESET switch and then turn the MODE knob to change how the Pendulum mode behaves. There are four possible settings which correlate with the four F/B/P/R labels around the knob.
"3 oscillator semi-modular synth, complex modulation capabilities, MIDI & CV control. 
