I just discovered this amazing new open source piece of software. 
It allows you to add modular synth rack modules and patch them to create crazy sounds. 
A really great way to experiment with modular synthesis without having to buy all the modules. 

https://i.imgsafe.org/e6/e6ef6c8f19.png

Check it out here:
https://vcvrack.com/

To get started quickly: 
- Download/install the software
- Right click somewhere in Rack, then add:
- Fundamentals -> VCO1
- Place it somewhere
- Also add VC Mixer
- And Core -> Audio interface.

Now patch:
- VCO-1 SAW to the VC-mixer's CH1. 
- CH1 out to the Audio Interface Output 1
- Turn up the volume on the VC mixer CH1 out

You should now here a saw wave. 

Happy patching :)