there is a new module from Cynthia / Cyndustries , the FM Module – I came there because of the matrix blog..
2-Linear Through-Zero FM
3-Linear FM Dynamic Depth Modulation
4-Bi-Phasic Waveform Morphing in Quadrature
5-Pulse Width Modulation
6-Variable Sync (from none to hard synch)
means: well, look at it!! it is a dual VCO made for FM.. one can be used as an lfo..
Interview with Cynthia Webster (not so new but may be interesting ..)