"The 40106 is a great chip to play with - you can make up to 6 simple oscillators from it, but I've chosen to implement simple Syncronization, so only have four Oscs. Each Osc has three rates possible by using a 3way switch. The Sync possibilities use SPDT C/O switches allowing Oscs 2 & 4 to be sync'd to either Osc 1 or Osc 2 (or Sync off).
The 4077 is a quad XNOR gate which gives an effect like ring-modulation (you could also use a 4070 XOR for similar effects)."
via BugBrand (Note this is the DIY page of circuits to try out on the BugBrand website. You'll find more there).
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