No Autotune on the NG except for the "hidden" DME for the radio position fix for the FMC. So yes, as BOAC says you allways have to manually tune the ADF. And of course you can listen to it, your choice if with a BFO tune or without. In europe BFO is rarely needed so the relevant switch usually is on off (says tone right next to the switch, close to the frequency selector of the ADF).