Lou basks in the sun above a vintage Yamaha CS-15 synthesis. From synthguy216 on Instagram.

That’s what a sunny afternoon is for. Lou recharging next to my CS-15

https://www.instagram.com/p/CdEQoKeOBGb/

The CS-15 is not one I know much about, compared to some of the others in Yamaha’s famous CS series. A bit from Vintage Synth Explorer:

This synth really has its own sound. The CS-15’s got style. Built like a tank with a lot of nice knobs and best of all, not one but two of those funny sounding multimode filters…The best things about it are the flexibility of the VCFs and the routings to the filters and envelopes. You can rout VCO 1 to both VCFs and the VCFs to any of the envelopes positive or negative voltage. The VCFs are 12 dB/Oct and are switchable between low, band or high-pass. They are the key to the nice sound of the Yamaha CS family. Other nice features are noise, external-in for processing other sounds, LFO with Sample & Hold for those bubbling sounds and an individual auto-bend for the VCOs.

https://www.vintagesynth.com/yamaha/cs15.php