Many thanks for all replies.
I will explore IdPi which appears to potentially give the I/O options that I need.
I did follow the DLNA Tools>Options>Media Network>Add or Configure DLNA route. And added suggested REW EQ settings to the DSP dialogue box. The Parametric EQ seems to have worked as checked by measurements using the Stereophile test CD track for frequency response. The MC frequency response with DSP correction is much smoother than the non-corrected response via LMS direct.
However the MC signal is designated as MP3 on the SBT. LMS is WMA losssless, all my audiofiles are WMA.Lossless. Not sure if that is a problem?
On the DLNA server association, I find that confusing because when I click on associate player, I get the greyed out option "only one server used by default". Image attached.
Appreciate the DMRA test option suggestion, I have downloaded and run that test and emailed to AFG,
Looking Forward To Progress
Regards