I have done this successfully before.
Works pretty well range about 75 m line of site.
But I think you have to keep the input voltage below 3V (Reference)
Transmit Xbee, was set up as follows DL11, MY10
DIO-0 = analoge input
Sample rate = 14Hex which is 20ms
The receiving Xbee, was setup DL10, MY11
i/o line passing set to 10 same as sending Xbee.
I used this to sent dB levels to a moving car while passing an microphone.
Next I am going to add a second microphone so i can measure both sides at the same time.
Hope this helps.
Both channels will be analog output.
I would like o get my range to double or even more.
If some one has any tips on that, i would appreciate it.
Also if any of you see mistakes please feel free to correct.