Street Electronics Echo Speech Synthesizer PC2 - Vintage Voice Synthesizer?

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Anyone know more about this one? I don't believe I've ever seen one of these before. The listing doesn't state much: "Up for sale or best offer is one Vintage Street Electronics Echo PC2 Synthesizer!

No card was included in the box, however it includes the external speaker box unit,manual,
and two larger floppy discs."

According to one of the floppies the brand is Street Electronics CORP. and the copyright date is 1988.

Update via Dave O Mahony in the comments: "Looks like the Echo 2 speech sound card add on for the Apple II. Seems it used the same chip as the Speak & Spell! [link] Auction doesn't include the card - just software and speaker!"

via Wikipedia:

"The Echo II was a plug-in expansion card, speech synthesizer card for the Apple II and Apple IIc personal computers that allowed applications to use speech synthesis. The Echo II used the TMS5220 speech synthesis chip to synthesize speech. The Echo II software could synthesize either unlimited text-to-speech using stitched phonemes, or play back raw LPC data for specific words, with resulting higher speech quality.

LPC (linear predictive coding) was the speech synthesis technology used, which allowed applications to encode speech data in a compact form. The Echo II used the TMS 5220 LPC Speech Chip which was popular in other speech synthesizers"

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Roland TB-303 Bassline Synthesizer with Kenton Retrofit SN 136800

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"Roland TB-303 Bassline synthesiser with Kenton retrofit. All works fine and just checked over by Roland referred engineer."

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Oberheim Matrix 1000 with Original Box

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Oberheim Xpander XP-1

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"In Excellent Condition. Barely used. Perfect Tuning, bright LEDS. One owner with invoice to prove...

Selling an entire studio, check my shop."

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Vintage Oberheim OB-Xa 8 Voice Analog Synthesizer Keyboard - Serviced w/Encore MIDI

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"The flagship of the OB series, this is an 8 voice, 120 Program Oberheim OB-Xa. The synth has been fully serviced with:

Rebuilt power supply, including new capacitors and beefed up bridge rectifiers
Rebuilt voice cards, including new capacitors and multi-turn initial frequency trimmers
Full calibration - power supply, DAC, and voice cards
Recent key bushings, buss bar cleaning and key contact adjusting
Recent battery change
Factory patches loaded, ready to go
I will also include an Encore MIDI Kit that I purchased for this keyboard that is not installed. ($300 value, kit is included "as is")

Overall good condition, with wear expected for its age (some scratches on the case, 2 cosmetically damaged rotary knobs, etc)."

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Oberheim DMX w/ Factory MIDI

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Oberheim OB-8 Vintage 1984 Analog Synth w/ Factory MIDI and Flight Case SN C34709

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Oberheim OB-Xa

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"Very good condition OBXA. Outstanding polysynth with new keybed bushings, rebuilt power supply, new tunings trim pots, and recapped voice cards. *8 voice*"

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Korg 770 - demo and test

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Published on Oct 19, 2016 Keith Negley

"This video is just to demonstrate the functions and working order of my Korg 770 analog synthesizer up for sale."

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"Korg 770 mono-synth in very good condition. Serial#: 770486
It is 100% functional. Every knob, slider and key works flawlessly with no scratchy pots or sticky keys/sliders. Previous owner had it serviced inside and out (5 years ago?) and had cv inputs installed in back. I've never used the cv inputs so I can't speak to how they work, but the owner demonstrated it to me when I bought it and they were functioning just fine. It has a few minor scuffs but nothing major and nothing that inhibits it's functionality. Note: It's missing the silver ring to the portamento knob (see pictures). The video link is my actual synth to demonstrate it all works great for this sale."

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PATCH.DIARY.2016.10.19

PATCH.DIARY.2016.10.19 from Phosfiend Systems on Vimeo.

"First composition with my new case, so much room! Not a lot of hands-on work here, except for some subtle sound tweaks, mostly driven by the DAW.

Main synthis the left ShapeShifter with voices 1,2 & Pulse outs being mixed hotly and fed into stereo (L&R) LPFs on the Korgasmatron.

Percussion is:

Kick via the Blue Lantern Asteroid BD V4

Clang via the Basimilus Iteritas

Snappy filter crackle thing via the seconf Shapesifter, being fed through the band pass of Ripples, with some semi-lost pitch data

A punch of Peaks voices with hihats and deep fm snaps"