If you want to make a lot of QSOs with stations you have not made QSO yet with on JTDX, the recommended setup is shown in the picture.
JTDX has perfect B4 control.
This is useful if you want to avoid duplicate QSOs as much as possible.
This is especially good for QSOs in special VHF/UHF propagation such as 6m band multi-hop Es, when you want to QSO with many NEW stations.
The response priority for stations that have called in response to CQ is shown in the attached image. If the stations are at the same level, the LoTW user has priority.