ADAU1466 HW slew mute modules parameter host update

Good morning

I'm developing a new product using the ADAU1466 SigmaDsp.

My schematic contains some mute HW slew module and I'm trying to manage they from my microcontroller

I've notice that if I try to write parameters in safeload way these module doesn't works.

In effect when I mute these module in SigmaStudio I notice that the iteraction used is a BLOCK WRITE and not a SAFELOAD WRITE

I've notice another strange thing: for update it I have to send values in little endian format and not in big endian how I use for safeload values update.

Can you explain me these difference?

It depends from module to module?

It' possible to update they using safeload management?

Thanks  in adavance