32-key keyboard
hp & lp filter similar to 700 800dv ...
ring modulator, 2 VCO, LFO, portamento, bend & vibrato.
Priority monophonic note the more acute
audio in & out, trigger, remote, there is the pedal for controlling FK1
https://www.korganalogue.net/korgother/Synthepedalmanual/synthpedalschematic.pdf
possibility of adding the kit Kenton CV / gate / filter
http://www.kentonuk.com/kenton/socket_kits/k770-3sk.html

UTILIZATION

There is no simpler, all parameters are under the eyes.

SOUNDS

I tend to continually change the settings, you can do a lot of things without touching the keyboard, I keep finding new sound or how to use it and sometimes I use the simplest way is is just a turn it on.
The emulators do not know how to present, the brutality, the dynamics and small detail of imperfection not to mention the accessibility settings.
And the fact that there is no memory requires a better understanding of the synthesis
and allows for good discovery.

There's the 2nd position of ring modulator that is really interesting
The setting of the second VCO can be hard, I sometimes take a tuner to fix it.

http://www.aliens-project.de/t_200512_korg_770.html

OVERALL OPINION

This is my first analog synth, I had a keyboard norlead then I immediately sold.

I made some pictures of the inside where you can see the build quality of the time (1976)

https://www.flickr.com/photos/pyexperience/2059175811/in/set-72157603283295775/