Ad Infinitum UMM402 Multi/Atten modified into Frac Ear

flickr by stickjones
(click for more)

Yamaha AN1X

flickr by Wytnoize

MuRF Filters

flickr by brotherloco
(click for more)

full size

Moog MuRF

New Schneiders Beuro

via navs.modular.lab where you will find more.

Modded Sequential Circuits Six-Track with Shadow Keys

flickr by kb_cheapmods
(click for more)

black shadow keys

inside a Six-Trak

Update via Cameron in the comments: "Looks like that six-trak has got the separate ins/outs mod for each of it's six voices also. Nice."

Poly.Touch Synthesizer

Poly Touch Synthesizer
"Poly.Touch is a tangible synthesizer with sound modules ( cubes) and devices ( MTT Screen). The basic idea of this Synthesizer is that electricity makes sound. By moving and playing with the cubes on the touch screen it creates the sounds and makes it for a easy use of a synthesizer with out loosing the performance behind it."
via https://twitter.com/Miaousse

Soundmaster Stix 305 drummachine

YouTube via f...ingharpsichord
"Some programmed patterns replayed, then i programme 'a beat'.

I'm in love with tha stix, shure i am ! I mean it has individual outputs, clock in, fill ins, 3 variations + 8 banks (so that means : 24 patterns !!!! lol), you can adjust the tone and if you press stop you can play as a thermin (load another video of that funtion up) !"

Stix 305 soundmaster Synthesizer

SynthBirds

YouTube via pmcskeeter
"This is a short sketch for a piece that I'm working on. It's made in MaxMSP and using simple oscillators but with detailed control (as you can see). The piece is for multi-channel but the sketch sounds OK in stereo."

DIY analog synth by Sasha Kulagin

YouTube via noisefault. via fischek.

"It's based on SoundLab Mini Synth with some mod's.
2 Osc + Noise source + 6,12,18,24 db/okt LP Filter and 12 dB/okt BP Filter, LFO and AR Envelope stage and Midi to CV converter inside.

From Russia with love!"

blofeld teil achtzehn

YouTube via thegoacyst
"can you make your blofeld do this? waves, combfilter, reverb...do i need more !?"

blofeld teil siebzehn

"i just can't help myself :-). what can you do with a patch named Assi_D_1 ? note that everything you hear is the blofeld and only the blofeld!"