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"This was an nice DIY project. The preset Teisco S100P has a really interesting internal structure (VCO, LP VCF, 2x EG, 3x LFO, PWM, formant filter (which is originally used in only one preset:), two HPF filters... plus spring reverb, aftertouch, analog flanger, which is unusual for a small monosynth. So I modified one preset to make it fully editable, see the panel on the right. In addition, a CV/Gate input has been added. It sounds great, dense, meaty.
Technically perfect, visually see photo - lots of 3D printed parts, including potentiometer caps, etc. The added editing panel can be easily removed (and the Teisco logo put back), but that would definitely be a shame.
Personal pickup possible in Prague (CZ) or Essen (DE)."
Here’s Yamaha’s classic duophonic (with a little effort) synthesizer with Don Solaris’ mods to facilitate chaining the VCFs for something closer to a 24db/octave response. There’s also a mod to the LFO’s rate control to get better use of it at audio rates - a welcome addition to the CS-15’s already pleasing sound palette. All told, the mods make a good sounding, but somewhat limited instrument rather less limited! It’s in great condition for a synth of this vintage, and was serviced a few years ago by the same techs who performed the mods. The sliders don’t have a “buttery smooth” glide, but are silent, as are the pots. I hear a very, very faint crosstalk between filters while the serial mod is not engaged, and I can’t say whether it’s due to the modification or, as with my old CS30, it’s part of the synth. It’s not noticeable in practical use, but if you’re actively looking for behaviors like this, you might hear it. It’s also like a 50 year old keyboard, so… I would rather have the single-voice CS-30 with its modulation possibilities, but I also just don’t have the space anymore. Please find the details of the mods here: https://greatsynthesizers.com/wp/wp-content/uploads/2019/07/cs-15_mods_DonSolaris.pdf Will ship from Berlin, Germany in its Yamaha-branded hard case.
"This was an nice DIY project. The preset Teisco S100P has a really interesting internal structure (VCO, LP VCF, 2x EG, 3x LFO, PWM, formant filter (which is originally used in only one preset:), two HPF filters... plus spring reverb, aftertouch, analog flanger, which is unusual for a small monosynth. So I modified one preset to make it fully editable, see the panel on the right. In addition, a CV/Gate input has been added. It sounds great, dense, meaty.
