This module does exactly what you think. It delivers 4 separate sinus waves each set at a 90 degree phase from each other.
So you have 0, 90, 180, 270 degrees.
It has 2 CV inputs to control frequency, CV1 without attenuator and CV2 with polarizer. Consequently the module can be used even as an experimental sine VCO but does NOT feature an exact 1V/oct CV input! It doen't track well, but can be used for effects and such.
It ranges from 0.1 Hz to 3.5 KHz and has the usual L/M/H switch.
I use it a lot to do interesting panning effects and phasing effects.
PROS: Good classic Doepfer build. Simple to use and understand.
CONS: Could have implemented 1 v/oct tracking to further its uses. You can really make some interesting FM sounds with it but you can't play them with CV :-(