Patching Exponential FM

This excerpt from my 'Learning Modular Synthesis' course (http://learningmodular.com/training/) demonstrates how to patch exponential FM using the Roland System 500 modules (although the concepts carry over to virtually any VCOs). Includes waveform and harmonic spectra displays to help you get an idea of what's going on: the carrier's frequency is being increased and decreased by the modulating oscillator.