Configuring audio hardware settings using JSON?

Hi all,

I have an Acer Revo R3710 connected to a Marantz NR1504 receiver using HDMI and the receiver is connected to my TV using another HDMI. I've configured HDMI passthrough for playing audio using TV speakers when the receiver is off. Also, I have configured XBMC for using all the capabilities of the receiver, but sometimes I prefer not starting the receiver for viewing some stuff like kids Tv shows, and here is where my problem starts. If the content is good enough for be played using the receiver but I don't want to use it, the video is not played fine (stuttering because bad audio configuration), and if I turn the receiver on, the video is played fine.

I need to switch from HDMI 5.1 with all capabilities enabled to HDMI 2.0 and all capabilities disabled depending of AV Receiver status (it is logged on xbmc.log). If the receiver is turned on , the HDMI device name is like "Marantz XXX" and if it is off, its name is like " NVIDIA XXX". Is there any way to configure this using JSON? I did it yesterday using debugging mode but no json command was registered at xbmc log when I switch it to 2.0. Also searched on JSON Api documentation, but no luck...

Any help?

Thanks
NaBz