diff --git a/drivers/f90/driver.f90 b/drivers/f90/driver.f90
index 33985910d..4ad8a4070 100644
--- a/drivers/f90/driver.f90
+++ b/drivers/f90/driver.f90
@@ -185,13 +185,15 @@ PROGRAM DRIVER
                   vstyle = 63
                ELSEIF (trim(cmdbuffer) == "qtip4pf-c-2-delta") THEN
                   vstyle = 64
+               ELSEIF (trim(cmdbuffer) == "qtip4pf-c-json-delta") THEN
+                  vstyle = 65
                ELSEIF (trim(cmdbuffer) == "gas") THEN
                   vstyle = 0  ! ideal gas
                ELSEIF (trim(cmdbuffer) == "dummy") THEN
                   vstyle = 99 ! returns non-zero but otherwise meaningless values
                ELSE
                   WRITE(*,*) " Unrecognized potential type ", trim(cmdbuffer)
-                  WRITE(*,*) " Use -m [dummy|gas|lj|sg|harm|harm3d|morse|morsedia|zundel|qtip4pf|pswater|lepsm1|lepsm2|qtip4pf-efield|eckart|ch4hcbe|ljpolymer|MB|doublewell|doublewell_1D|water_dip_pol|qtip4pf-sr|qtip4pf-c-1|qtip4pf-c-2|qtip4pf-c-json|qtip4pf-c-1-delta|qtip4pf-c-2-delta|harmonic_bath|meanfield_bath] "
+                  WRITE(*,*) " Use -m [dummy|gas|lj|sg|harm|harm3d|morse|morsedia|zundel|qtip4pf|pswater|lepsm1|lepsm2|qtip4pf-efield|eckart|ch4hcbe|ljpolymer|MB|doublewell|doublewell_1D|water_dip_pol|harmonic_bath|meanfield_bath|qtip4pf-sr|qtip4pf-c-1|qtip4pf-c-2|qtip4pf-c-json|qtip4pf-c-1-delta|qtip4pf-c-2-delta|qtip4pf-c-json-delta] "
                   STOP "ENDED"
                ENDIF
             ELSEIF (ccmd == 4) THEN
@@ -678,7 +680,7 @@ PROGRAM DRIVER
                   STOP "ENDED"
                ENDIF
                CALL qtip4pf_sr(atoms,nat,forces,pot,virial)
-            ELSEIF (vstyle .ge. 60 .and. vstyle .le. 64 ) THEN 
+            ELSEIF (vstyle .ge. 60 .and. vstyle .le. 65 ) THEN 
                ! qtip4pf committee potential. adds two different types of (small)
                ! LJ potentials just to have variations on a theme
 
@@ -693,7 +695,7 @@ PROGRAM DRIVER
                   WRITE(*,*) " qtip4pf PES only works with orthorhombic cells", cell_h(1,2), cell_h(1,3), cell_h(2,3)
                   STOP "ENDED"
                ENDIF
-               IF (vstyle == 63 .or. vstyle == 64) THEN
+               IF (vstyle == 63 .or. vstyle == 64 .or. vstyle == 65) THEN
                   pot = 0.0
                   forces = 0.0
                   virial = 0.0
@@ -735,7 +737,7 @@ PROGRAM DRIVER
                   CALL LJ_getall(rc, 2.5d0, 2d-6, nat, atoms, cell_h, cell_ih, index_list, n_list, pot, forces, virial)
                ELSEIF (vstyle == 61 .or. vstyle == 64) THEN ! type 2
                   CALL LJ_getall(rc, 2.1d0, 24d-6, nat, atoms, cell_h, cell_ih, index_list, n_list, pot, forces, virial)
-               ELSEIF (vstyle == 62) THEN ! returns both as json
+               ELSEIF (vstyle == 62 .or. vstyle == 65) THEN ! returns both as json
                   ! return both the committee members as a JSON extra string
                   CALL LJ_getall(rc, 2.5d0, 2d-6, nat, atoms, cell_h, cell_ih, index_list, n_list, pot, forces, virial)
                   
@@ -1016,7 +1018,7 @@ PROGRAM DRIVER
                CALL writebuffer(socket,TRIM(longbuffer),cbuf)
                IF (verbose > 1) WRITE(*,*) "    !write!=> extra: ", &               
      &         initbuffer
-            ELSEIF (vstyle==62) THEN ! returns committee data
+            ELSEIF (vstyle==62 .or. vstyle==65) THEN ! returns committee data
                cbuf = LEN_TRIM(initbuffer)
                CALL writebuffer(socket,cbuf)
                CALL writebuffer(socket,initbuffer,cbuf)
@@ -1046,9 +1048,7 @@ PROGRAM DRIVER
     CONTAINS
       SUBROUTINE helpmessage
          ! Help banner
-
-         WRITE(*,*) " SYNTAX: driver.x [-u] -h hostname -p port -m [dummy|gas|lj|sg|harm|harm3d|morse|zundel|qtip4pf|pswater|lepsm1|lepsm2|qtip4p-efield|eckart|ch4hcbe|ljpolymer|..."
-         WRITE(*,*) "...|MB|doublewell|doublewell_1D|harmonic_bath|meanfield_bath|morsedia|qtip4pf-sr|water_dip_pol]"
+         WRITE(*,*) " SYNTAX: driver.x [-u] -a address -p port -m [dummy|gas|lj|sg|harm|harm3d|morse|morsedia|zundel|qtip4pf|pswater|lepsm1|lepsm2|qtip4p-efield|eckart|ch4hcbe|ljpolymer|MB|doublewell|doublewell_1D|water_dip_pol|harmonic_bath|meanfield_bath|qtip4pf-sr|qtip4pf-c-1|qtip4pf-c-2|qtip4pf-c-json|qtip4pf-c-1-delta|qtip4pf-c-2-delta|qtip4pf-c-json-delta]"
          WRITE(*,*) "         -o 'comma_separated_parameters' [-v] "
          WRITE(*,*) ""
          WRITE(*,*) " For LJ potential use -o sigma,epsilon,cutoff "
@@ -1058,7 +1058,7 @@ SUBROUTINE helpmessage
          WRITE(*,*) " For qtip4pf-efield use -o Ex,Ey,Ez with Ei in V/nm"
          WRITE(*,*) " For ljpolymer use -o n_monomer,sigma,epsilon,cutoff "
          WRITE(*,*) " For gas, dummy, use the optional -o sleep_seconds to add a delay"
-         WRITE(*,*) " For the ideal qtip4pf, qtip4p-sr, zundel, ch4hcbe, nasa, doublewell or doublewell_1D no options are needed! "
+         WRITE(*,*) " For the ideal, qtip4pf*, zundel, ch4hcbe, nasa, doublewell or doublewell_1D no options are needed! "
        END SUBROUTINE helpmessage
 
    END PROGRAM
diff --git a/examples/features/committee_models/README.md b/examples/features/committee_models/README.md
index 01bbf5769..7ba5fa703 100644
--- a/examples/features/committee_models/README.md
+++ b/examples/features/committee_models/README.md
@@ -12,4 +12,6 @@ All the simulations here use an artificial committee model built by arbitrarily
 
 `weighted_baseline` provides an example of how to use the uncertainty estimate to revert the predictions to a baseline model when the error becomes too large. The ML model in this case is meant to describe a correction over the baseline, which is smoothly suppressed if its uncertainty increases beyond a cutoff.  
 
-`extra_json` shows how to run this kind of simulations with a model that provides all the estimates in one go as part of a .json formatted `extras`` string
+`extra_json` shows how to run this kind of simulations with a model that provides all the estimates in one go as part of a JSON formatted `extras`` string
+
+`weighted_baseline_extra` replicates the `weighted_baseline` model using a JSON-based ensemble
diff --git a/examples/features/committee_models/weighted_baseline/test_settings.dat b/examples/features/committee_models/weighted_baseline/test_settings.dat
index 6359628fb..efc1cb870 100644
--- a/examples/features/committee_models/weighted_baseline/test_settings.dat
+++ b/examples/features/committee_models/weighted_baseline/test_settings.dat
@@ -1,4 +1,4 @@
 driver_model dummy
 driver_model2 dummy
-driver_model3 dummt
+driver_model3 dummy
 nsteps 10
diff --git a/examples/features/committee_models/weighted_baseline_extra/input.xml b/examples/features/committee_models/weighted_baseline_extra/input.xml
new file mode 100644
index 000000000..77d12b014
--- /dev/null
+++ b/examples/features/committee_models/weighted_baseline_extra/input.xml
@@ -0,0 +1,59 @@
+<simulation verbosity='medium' threading='false'>
+  <output prefix='simulation'>
+    <properties stride='10' filename='out'>  [ step, time{picosecond}, conserved{electronvolt}, temperature{kelvin}, kinetic_cv{electronvolt}, potential{electronvolt}, pressure_cv{megapascal} ] </properties>
+    <trajectory filename='pos' stride='10'> positions </trajectory>
+    <trajectory filename='committee_pot' stride='10' extra_type='committee_pot'> extras </trajectory>
+    <trajectory filename='committee_force' stride='10' extra_type='committee_force'> extras </trajectory> 
+    <trajectory filename='committee_virial' stride='10' extra_type='committee_virial'> extras </trajectory> 
+    <trajectory filename='baseline_pot' stride='10' extra_type='baseline_pot'> extras </trajectory>
+    <trajectory filename='baseline_force' stride='10' extra_type='baseline_force'> extras </trajectory> 
+    <trajectory filename='baseline_virial' stride='10' extra_type='baseline_virial'> extras </trajectory> 
+    <trajectory filename='weight' stride='10' extra_type='wb_mixing'> extras </trajectory>    
+    <checkpoint stride='100'/>
+  </output>
+  <total_steps>100</total_steps>
+  <prng>
+    <seed>31415</seed>
+  </prng>
+  <ffcommittee name="committee">
+  <!--
+      This is just an example of the structure of a baselined-committee model.
+      The baseline is a QTIP4P/f water potential, while the corrections are 
+      artificial LJ terms.
+  --> 
+    <baseline_name> base </baseline_name>
+    <alpha> 1.5 </alpha>
+    <baseline_uncertainty units="electronvolt"> 0.1 </baseline_uncertainty>
+    <active_thresh> 0.05 </active_thresh>
+    <ffsocket name='base' mode='unix' matching="any" pbc="false">
+        <address> base </address> <latency> 1e-3 </latency>
+    </ffsocket>
+    <ffsocket name='driver-combo' mode='unix' matching="any" pbc="false">
+        <address>h2o-comm.json</address> <latency> 1e-3 </latency>
+    </ffsocket>
+    <parse_json> True </parse_json>
+  </ffcommittee>
+  <system>
+    <initialize nbeads='4'>
+      <file mode='xyz'> water_216.xyz </file>
+      <velocities mode='thermal' units='kelvin'> 300 </velocities>
+    </initialize>
+    <forces>
+        <force forcefield='committee' nbeads='1'> 
+            <!-- adding these to force_extras will make the committee extras be treated properly with ring-polymer contraction, ect. -->
+            <force_extras> [committee_pot, committee_force, committee_virial, baseline_pot, baseline_force, baseline_virial, wb_mixing] </force_extras>
+        </force>
+    </forces>
+    <motion mode='dynamics'>
+      <dynamics mode='nvt'>
+        <timestep units='femtosecond'> 0.5 </timestep>
+        <thermostat mode='pile_g'>
+          <tau units='femtosecond'> 10 </tau>
+        </thermostat>
+      </dynamics>
+    </motion>
+    <ensemble>
+      <temperature units='kelvin'> 300 </temperature>
+    </ensemble>
+  </system>
+</simulation>
diff --git a/examples/features/committee_models/weighted_baseline_extra/run.sh b/examples/features/committee_models/weighted_baseline_extra/run.sh
new file mode 100644
index 000000000..1c47aacdf
--- /dev/null
+++ b/examples/features/committee_models/weighted_baseline_extra/run.sh
@@ -0,0 +1,18 @@
+ipi=i-pi
+driver=i-pi-driver
+sleep_time=2
+
+${ipi} input.xml > log.i-pi & 
+echo "# i-PI is running"
+
+echo "# Waiting for ${sleep_time} (s) before executing driver"
+sleep ${sleep_time}
+
+${driver} -u -a base -m qtip4pf &
+${driver} -u -a h2o-comm.json -m qtip4pf-c-json-delta &
+
+echo "# All driver instances are running"
+
+wait
+
+echo "# Simulation complete"
diff --git a/examples/features/committee_models/weighted_baseline_extra/test_settings.dat b/examples/features/committee_models/weighted_baseline_extra/test_settings.dat
new file mode 100644
index 000000000..7814c9f37
--- /dev/null
+++ b/examples/features/committee_models/weighted_baseline_extra/test_settings.dat
@@ -0,0 +1,3 @@
+driver_model dummy
+driver_model2 dummy
+nsteps 10
diff --git a/examples/features/committee_models/weighted_baseline_extra/water_216.xyz b/examples/features/committee_models/weighted_baseline_extra/water_216.xyz
new file mode 120000
index 000000000..58a9ede12
--- /dev/null
+++ b/examples/features/committee_models/weighted_baseline_extra/water_216.xyz
@@ -0,0 +1 @@
+../../../init_files/water_216.xyz
\ No newline at end of file