MATRIXSYNTH

DIY synthesizer

YouTube via harrypotter2k5
"Broadly, the purpose of this project was to create an Analogue modelling musical synthesizer;
that is, a synthesizer implemented using both analogue and digital components that intends to emulate the sounds of traditional analogue synthesizers, whilst being controllable through modern-day digital protocols such as the Musical Instrument Digital Interface (MIDI).
The synthesizer platform exists upon its own standalone hardware, and may be controlled
using a variety of existing MIDI-capable instruments, including keyboards, guitars and drums.
Additionally, the unit features its own innovative touch-screen interface which intends to provide simple-and-intuitive control of the system, but with an unprecedented ability to customize and control synthesizer parameters and sound generation.
Special attention has been placed upon the usability of the synthesizer, particularly within the realms of it being played by musicians in a live environment.
The units MIDI capabilities also mean that it is easily combined with professional studio equipment and sequencing software such as Cubase VST"

Update via Harry Potter in the comments: "I've got a development site up at http://synthesia.sourceforge.net for this synth, but it's still under heavy development and CAEnot all of our files/ documentation/demos are online yet. Will keep you posted"

RC CIRCUIT BENT VINTAGE CASIO MT-210 SYNTH KEYBOARD

YouTube via djwidow420
"A CIRCUIT BENT CASIOTONE MT-210 WITH 16 MODIFIATIONS BY RESONANCE CIRCUITS"

Spectral Audio Neptune 2

YouTube via Dogboy73
"oscillator 2's square wave with osciallator 1 being mixed in later. Filter & filter envelope are being tweaked. Neither of the Neptune 2's FX's were used."

Demo Roland JUNO 60 + SONAR 8 workstation

YouTube via magevers
"With this demo/cover of Vangelis Conquest of paradise, i want to show how great the vintage roland JUNO 60 sounds.
Everything was recorded on 12 audio tracks without using midi sequencer or
midi.
JUNO 60: all sounds
TR 606: drums
Effects: SONAR 8"

Easy Synthing: Nord Lead 2X keys (by Alien Robot Dance)

YouTube via se7ense7
"I just got this synth. I mean, like 30 minutes or so.
But it's just THAT hands-on that you really don't need the manual a lot to get started.
Some basic tweakings on this swedish synthesizer."

Yamaha CS30

via the forum where it is listed for sale along with other items. As always click on the image for the full size shot.

"Yamaha CS-30s. powerful monosynth with 2 VCOs, 2 multimode filters and analog sequencer."