This doepfer module offers lots of functionality and has many uses.
With this module you get a VCLFO, VCA (switchable to voltage controlled polarizer) and a VC delay unit: voltage controlled linear attack envelope (only one parameter: attack) for delayed LFO operation in combination with the VCA.
I use it in audio and video modular patches, don't think there was any patch that I did not use it in.
The knobs are nice and stiff, so you can change values very slightly. Jack inputs are decent quality too.
A very interesting feature is that you can slow down the LFO period up to 3 hours or more by setting a jumper on the back (more info on the doepfer site). This is perfect for generative, experimental, drone music and generative video.