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Shelves’ two parametric sections are, behind the scenes, full-blown 12-dB multimode filters. The 4hp expander panel gives you access to their low-pass, band-pass, and high-pass outputs.
Adjust the parametric section’s frequency to control the cutoff of the filter, and the Q factor to control its resonance.
The Expander module does not draw current.
Connecting the expander
The expander is provided with two cables. Check that they are connected like on this picture (in particular, check the orientation of the red stripe).
Connect the lower cable to the lower connector on the back of Shelves’ circuit board.
Connect the upper cable to the upper connector on the back of Shelves’ circuit board.
You can now connect back Shelves’ power connector.