I like this module so much that I own 2 of them. In essence it is a function generator combined with a VCA. I primarily use it for running audio through, using it as an envelope and VCA. However, like must function generators it can be used for other purposes such as an LFO, Ring Mod etc. Unlike other function generators that I have used is does have a nice long decay time unpatched: there is no need for an external CV source to increase its decay time. It is a really well built and sturdy module.