Nice archive film here of Roger Limb of the BBC Radiophonic workshop giving an introduction to synthesis using an Electonic Music Studio (EMS) Synthi 100 - a huge 12 oscillator machine five foot wide and five foot high.
https://www.facebook.com/BBCArchive/videos/482177565488612
Sorry it's a Facebook link - couldn't find the video existing outside of it.
There's some nice sounds in it though - lovely filters and I enjoyed his detuned harmonics and calm 70s presenation style.