"Being that this is a semi-modular synth, you can interface it with other CV-compatible modular pieces --- albiet the XS uses 1/4" jacks, similar to the Korg MS-20.
"The MKS80 Super Jupiter is a classic. One of the greatest synths of all time and the king of the MKS series. Made from 1984 through to 1987 the MKS80 is very similar to a rack version of the Jupiter 6 & 8 series of keyboard synths. Some claim it’s is a version of the Jupiter 8 and others a Jupiter 6. In reality it is somewhere between the two. The only MKS series synths with real VCO’s was produced in 2 distinct versions.
Serials number up to 511800 (OS Version 4) used standard CEM 3340 VCO chips. Most people claim that these early versions are distinctly better. Serial numbers from 511801 onwards (OS Version 5) used custom Roland chips. The Roland IR-3R03 VCO and IR-3R05 VCF. The cross-modulation and filter resonance were tamed to reduce distortion and the ADSR decay rate reduced.
"Rare 1970s Music Technology, Inc (Crumar) CPB-2 foot pedal analog bass synthesizer, made by Elettronica in Italy. This warm, thick, and great sounding analog foot bass has very useful synthesizer features that allow for a wide range of timbral possibilities, all of which have great sonic integrity - some compare this model to the Moog Taurus for sonic similarities. Features Tuner knob (has been replaced/repaired - is now a continuous pot, but still functions); VCF Envelope, Cutoff, and Resonance knobs; Release switch - allows a note to cutoff with the release or to ring out at 100% until next note is triggered; Doubling switch - a nice chorus effect; Footage switch - selects high or low octave; Waveform switch - selects sawtooth or triangle waveform; and sustain and master volume wheels in nice vintage orange. The master switch is a bit finicky as a piece of the plastic is broken off, but it still functions (if gigging, I would recommend taping it in the "on: position and unplugging the cable to power off). All else is perfect working order and all original. 
"This is the last model of ARP Sequencer produced - it is better built and more in demand than the earlier verion with the wooden sides. This analog sequencer was designed to be used with the ARP 2600 and Odyssey but will work with most other analog synths with CV and gate inputs. 
Instead of entering notes from a keyboard, this sequencer gives you knobs to tweak the pitch with your fingers - all you have to do is dial up the sequence you want, with no knowledge of notes necessary. Since this sequencer outputs voltages, as long as you have the right connections on your synth, you can use it to control a lot more than just pitch. Many old synths have CV inputs for volume and filter frequency, which can also be controlled from this sequencer. This is great for people who like to tweak until they come up with something interesting. It's a much more hands on and experimental approach to making music. This sequencer is the perfect tool for recreating that early electronic music vibe, is great for making new techno loops or experimental music. It's not just limited to these styles but is best suited to them. 
Its an excellent piece to interface with most modular synthesizers because it has patchpoints for all of its features. It's a truly flexible and unique tool that is very different from most digital sequencers people are familiar with. It's also different from most other analog sequencers because it has more patchpoints and therefore greater flexibility. This is why the ARP sequencer is the most sought after of the analog sequencers."
"This is the last edition of the Pro-One (1982) with the power supply NOT on the motherboard but separate, as it should be. Serial No.#8007
Difficult to edit via the front panel. You can find software editors out there including these and a massive iPad editor I made for use with The Missing Link for here.
