Ray Wilson of MFOS demonstrates the use of his WSG project under the control of a basic sequencer. Skip ahead to the 4m20s mark for a straightforward explanation of how this simple mod does its thing. Though Ray uses an MFOS 10-step sequencer with above, this would likely work with any basic 4017-based sequencer (or any other 0-9V output for that matter). Detailed instructions available on the WSG mods page.