This video, via Voltage Control Lab, looks at an alternate use for an envelope generator – using it as an oscillator. 

This approach to using an envelope generator as an oscillator requires using an oscillator square wave as a trigger – so you don’t get a ‘free extra oscillator’, but you get a different oscillator, with additional tone shaping options.

If you’ve tried using an EG as an oscillator, leave a comment and let us know your approach!