FMP24, so Fast Lane? If so, there is the DSD+ -F<num> command line flag.
A -F<num> (file number) command line parameter has been added
When this parameter is used, DSD+ modifies the names of its output files
in order to avoid name collisions with other copies of DSD+
The affected files are DSDPlus.wav and DSDPlus.event
The per-call Record folder's name is also modified
Use this feature if you want multiple copies of DSD+ to share the same
networks, sites, groups, radios and frequencies files
This feature should allow you to simultaneously monitor multiple control channels (sites)
of a network with all group and radio data being stored in the DSDPlus.groups
and DSDPlus.radios files
The sites can be part of a single network or multiple networks;
multiple protocols can be simultaneously monitored
This feature WILL NOT allow you to follow control/rest/voice channel changes
on multiple sites. Upgrades to FMPA and FMP24 will be required to support that.
At present, you must use separate DSD+ installations (folders) to trunk track multiple
site or systems.
So just add -F2 when you run the second copy of DSD+...