Patching with AudioProcessorGraph

Hello to everyone,

I am currently using an AudioProcessorGraph to build a Modular synth.
The methods given to connest the nodes help me deciding the general processing chain, but I would like to introduce frequency modulation from a VCO to the other. VCOs in this case are AudioProcessors that emit a sine wave. the addConnection method is not helpful, since it connect busses (and eventually sums different signals that go into the same input bus), without multiplying the signals coming from the two given busses.

Is there any easier solution than making my own PatchConnection : public Connection class? Because in this case I would have to make a custom graph as well.