CV Expander doesn’t require a power supply, it draws power from the Sequential Switch. Refer to the picture below on how to connect both modules! Sequential Switch CV Expander is connected to the Sequential Switch via IN/OUT jack switching lugs, which means that if you patch something into IN/OUT jack, the relevant input gets disconnected from the CV Expander. If you use SS with CV Expander connected to sequence sound sources, make sure, you skip all steps that are not used (no patch cables connected)! If you do not do that, the DC from the CV Expander will get into the audio path and you will hear an undesired click.