MATRIXSYNTH

DIY Digital Audio Processor/Synthesizer Demo #3 - The Synthesizer

YouTube via TheMason76
"Shows the demo of the Synthesizer itself. The Notes are played from the internal Sequencer (curently only one line). The demo shows 2 of the 3 oscillators, the filter, the modulation and the effect-section. Sound may be not always in synch to video."

Novation Launchpad: Radar Sequencer

YouTube via littlescale
"Novation Launchpad: Radar Sequencer http://little-scale.blogspo..."

drumKAT v2.0 as Analog Trigger To MIDI Converter Synth

YouTube via DrZEEworkshop. follow-up to this post
"Dr ZEE Workshop modified drumKAT v2.0 as Analog Trigger To MIDI Converter demonstration. For detailed info of this project visit: http://www.mzentertainment.com/studio... .
In this video drumKAT acts as analog trigger sequencer to MIDI converter, so analog sequencer "drives" midi synthesizer (Roland JV-1080)."

Update:

RAW-BEAT-QUAD Analog Drum Rythm Synthesizer and ASC-1 Sequencer

"General Demonstration in-action video of Dr ZEE WORKSHOP RAW-BEAT-QUAD 4x4
Analog Drum / Rhythm Synthesizer (see project details here: http://www.mzentertainment.com/studio... ),
ANALOG SEQUENTIAL CONTROLLER ASC-1 Plus 8x4x8x8 / Trigger, Gate, Vc and Rs Sequencer (see project details here: http://www.mzentertainment.com/studio... ) and Analog Sequential Controller Satellite SC-S Monitor / Test Meter / Rs to Vc Converter Unit (see project details here: http://www.mzentertainment.com/studio... ) ."

Super GrooveAxe

Super GrooveAxe from Gadget Gangster on Vimeo.

"The Super GrooveAxe is a mini drum machine / sequencer. 4 sounds are available, and the playback speed of the pattern can be controlled. It's available as a kit on Gadget Gangster - gadgetgangster.com/241"
You can find more pics and instructions on instructables

via Nick: "I've just finished and put up the Super GrooveAxe, it's a mini drum-machine. I'm pretty proud of the project, I did the pcb design and grandtippler did the software to run it. Your readers might find it interesting - there's more info on instructables - http://www.instructables.com/id/Super-GrooveAxe-Mini-Drum-Machine/"

Yamaha CS6r Synthesizer Demo

YouTube via AndreVatke

Yamaha CS1x Control Synthesizer

YouTube via AndreVatke
"Doodle on the Yamaha CS1x showing FILTER CUTOFF and RESONANCE changes using knobs as well as switching between patch "scenes" using the mod wheel."

Roland SH-32 Virtual Analog Synthesizer

YouTube via AndreVatke
"A demo of the Roland SH-32 Synthesizer - desktop module"

Waldorf Micro-Q Virtual Analog Synthesizer Demo

YouTube via AndreVatke

KORG KEIO MINIPOPS 7 rhythm machine JARRE OXYGENE 4

YouTube via AnalogAudio1
"Demo of the Mini Pops 7 - shows the Minipops 7 in action... This is the drumbox heard on JEAN-MICHEL JARRE's album OXYGENE.

The Minipops model 7 is the most complex and the best machine of the Korg's Minipops Series. It has 16 different drum sounds and 20 preset patterns. You can combine all patterns, you have freedom to combine everything! Some combinations sound great - the OXYGENE 4 groove is a good example."