One other thing you can try is see if your JVC driver supports the test command. I use it on a few devices to use commands that aren't in the integration.
Test won't be one of the commands in the driver command test section. What comes after "test~" is whatever command you want to use, as found in the documentation for IP or serial control.
For example, I set up my Marantz AV10 AVR to use expanded inputs. This is a simplified example command to switch to the expanded input:
AV|31~test~SIAUX4!
SIAUX4 was the command I found in the Marantz/Denon documentation. With the test command, I can implement any of the supported commands for the device, not just what's included in the driver, which is usually just a subset. I did the same thing to use some additional commands with my TiVo.
Kyle
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