Can someone please explain Drive and Release?

I don’t understand what kind of compression it is. Can someone please explain what the compressor does? How it effects the output? What are drive and release and how do they interact with each other? Might be a silly question but it’s the only thing on the op1 I don’t understand. Also read somewhere on this forum that a side chain effect can be emulated using the compressor… how would this be done?


Thanks