I'm at work at the moment so haven't got access to it to check, but iirc the Expander E4 is not an EX bus device, it's an older Ex device so it works one way but not two way, therefore in the transmitter's device explorer you can't see the devices attached to the expander because it won't allow you to alter their settings. I remember having problems trying to use the Expander E4, it may that you need to change the data type on the jetibox input, I have a vague memory of having to change the data type at the CB200 Ext port for the sensor data to appear at the Tx.

I have a vario working nicely as you wish with rising and falling tones and a deadband to keep quiet at the glider's natural sink rate, I may get a chance later this week to copy the settings for you if someone else doesn't beat me to it!