Circular buffers and Algobuilder

[Davidcs]

new to algobuilder.

I want to have a float input circular buffer that then goes through an IIR filter. When I add both to algobuilder I can't seem to wire the circular buffer to the IIR filter block, presumably as the circular buffer output bus width is showing as a bus with the number of outputs as the number of elements in the circular buffer (qty 10) when the IIR is single float input.

How do I extract one float from the circular buffer at an index reference point using algobuilder?