Enabling 3rd input pin for mu on SbNLMSV3

Hi,

Docs say a 3rd input pin can be enabled for SbNLMSV3:

The constructor argument MUINPUT determines where the adaptation parameter mu is taken from. By default, MUINPUT = 0 and the adaptation parameter is taken from the internal parameter .mu; the same factor is used for all subbands. If MUINPUT = 1, then the module has a 3rd input pin.This pin contains real data of size FFT size / 2 + 1 and each point specifies the mu factor for each subband. This allows external logic to be used when computing mu and allows mu to vary between subbands. When MUINPUT = 1 then the internal paramter .mu is ignored.

This is exactly what I want to do, but I can't see how to actually enable that pin. Any suggestions?

https://documentation.dspconcepts.com/awe-designer/latest-version/sbnlmsv3