MATRIXSYNTH

Sbuzzizzio play synthesizers - part. 1

YouTube via Sbuzzizzio. Note he's playing the Kawai K5000s Additive Synthesizer. It also has PCM samples, so it could be either. Anyone know the device in the background? Feel free to spot the other synths.
Definitely an XT in the background (shadow XT or custom paint job) - via AHC in the comments.

BOEHM SOUNDLAB MODULAR

YouTube via whiteeagle1973made
"A Looped patch, made in the Boehm Soundlab modular. If you set the VCA gain at the maximum, the sound stays always on, no matter what the ADSR settings are. So this is useful for loops and complex effects. This clip is somewhat dark, the sound is captured by the camera's mic, but you get an idea what this little beast is capable for."

Yamaha CS01 New Hybrid Waveforms Modification

YouTube via rolandsh1000
"Inspired by some work by Plutonique9, I opened up my Yamaha CS01 analog monophonic mini-synth and discovered that you can make the tone generator chip generate (at least) 3 new hybrid waveforms.

There are some caveats:
-depending on the waveform you hybridize, the footage switch gets out of wack on one of the settings (but you still get 3 of the 4 footages working correctly and thus the full range of the keyboard).
- on that one wacked out footage setting, any glissando means a drone on one note and a walk-up/walk-down gliss"