In this video clip, How Audio’s David Alexander talks about basic wave types and how they relate to the oscillator of a synthesizer.
What is the role of an Oscillator in a synthesizer? What are the basic wave forms? What are frequencies?www.HowAudio.com.

MusicMik demonstrates what VCO sync looks like with an oscilloscope:
I made this video during development of another VCO, my synchronization master is just a provisoric square oscillator, which produces a very unclean signal. Besides this i don’t have the audio equipment in the lab to create a better audio on this But the main [...]

Cyndustries has announced a new type of modular synthesizer oscillator, the Zeroscillator, an all-analog through-zero FM oscillator. According to Cyndustries, the Zeroscillator will be “the first time traditional digital FM synthesis is possible in an all analog signal path.”
The Zeroscillator “is an original design by Mark Barton,” explains Cyndustries Cynthia Webster. “Mark, and John Ross, [...]