diff --git a/benchmarks/engines/busyring/arbor/ring.cpp b/benchmarks/engines/busyring/arbor/ring.cpp
index 21a5cf1..a746b24 100644
--- a/benchmarks/engines/busyring/arbor/ring.cpp
+++ b/benchmarks/engines/busyring/arbor/ring.cpp
@@ -32,7 +32,7 @@ using arb::cell_size_type;
 using arb::cell_member_type;
 using arb::cell_kind;
 using arb::time_type;
-using arb::cell_probe_address;
+using arb::cell_probe_membrane_voltage;
 
 // Writes voltage trace as a json file.
 void write_trace_json(std::string fname, const arb::trace_data<double>& trace);
@@ -127,12 +127,9 @@ class ring_recipe: public arb::recipe {
     }
 
     arb::probe_info get_probe(cell_member_type id) const override {
-        // Get the appropriate kind for measuring voltage.
-        cell_probe_address::probe_kind kind = cell_probe_address::membrane_voltage;
         // Measure at the soma.
         arb::mlocation loc{0, 0.0};
-
-        return arb::probe_info{id, kind, cell_probe_address{loc, kind}};
+        return arb::probe_info{id, 0, cell_probe_membrane_voltage{loc}};
     }
 
 private:
diff --git a/validation/src/arbor-cable-steadystate/arbor-cable-steadystate.cpp b/validation/src/arbor-cable-steadystate/arbor-cable-steadystate.cpp
index 57db949..cd86d90 100644
--- a/validation/src/arbor-cable-steadystate/arbor-cable-steadystate.cpp
+++ b/validation/src/arbor-cable-steadystate/arbor-cable-steadystate.cpp
@@ -66,7 +66,7 @@ struct rc_cable_recipe: public arb::recipe {
     probe_info get_probe(cell_member_type id) const override {
         // n probes, centred over CVs.
         double pos = probe_x(id.index)/length;
-        return probe_info{id, 0, cell_probe_address{{0, pos}, cell_probe_address::membrane_voltage}};
+        return probe_info{id, 0, cell_probe_membrane_voltage{{0, pos}}};
     }
 
     util::unique_any get_cell_description(cell_gid_type) const override {
@@ -128,7 +128,6 @@ int main(int argc, char** argv) {
     double t_sample = 0;
     sim.add_sampler(all_probes, explicit_schedule({t_end-dt}),
         [&voltage,&t_sample](cell_member_type probe_id, probe_tag, std::size_t n, const sample_record* rec) {
-            std::cout << "probe_id: " << probe_id.gid << ", " << probe_id.index << std::endl;
             voltage.at(probe_id.index) = *rec[0].data.as<const double*>();
             t_sample = rec[0].time;
         });
diff --git a/validation/src/arbor-rallpack1/arbor-rallpack1.cpp b/validation/src/arbor-rallpack1/arbor-rallpack1.cpp
index c7e2889..a0a4cf3 100644
--- a/validation/src/arbor-rallpack1/arbor-rallpack1.cpp
+++ b/validation/src/arbor-rallpack1/arbor-rallpack1.cpp
@@ -66,7 +66,7 @@ struct rc_rallpack1_recipe: public arb::recipe {
 
     probe_info get_probe(cell_member_type id) const override {
         double pos = id.index==0? x0: x1;
-        return probe_info{id, 0, cell_probe_address{{0, pos}, cell_probe_address::membrane_voltage}};
+        return probe_info{id, 0, cell_probe_membrane_voltage{{0, pos}}};
     }
 
     util::unique_any get_cell_description(cell_gid_type) const override {
diff --git a/validation/src/arbor-rc-exp2syn-spike/arbor-rc-exp2syn-spike.cpp b/validation/src/arbor-rc-exp2syn-spike/arbor-rc-exp2syn-spike.cpp
index 7ed915d..fd5d2e1 100644
--- a/validation/src/arbor-rc-exp2syn-spike/arbor-rc-exp2syn-spike.cpp
+++ b/validation/src/arbor-rc-exp2syn-spike/arbor-rc-exp2syn-spike.cpp
@@ -88,7 +88,7 @@ struct rc_exp2syn_spike_recipe: public arb::recipe {
     }
 
     probe_info get_probe(cell_member_type id) const override {
-        return probe_info{id, 0, cell_probe_address{soma_centre(), cell_probe_address::membrane_voltage}};
+        return probe_info{id, 0, cell_probe_membrane_voltage{soma_centre()}};
     }
 
     std::vector<event_generator> event_generators(cell_gid_type gid) const override {
diff --git a/validation/src/arbor-rc-expsyn/arbor-rc-expsyn.cpp b/validation/src/arbor-rc-expsyn/arbor-rc-expsyn.cpp
index 24da91f..3d878ce 100644
--- a/validation/src/arbor-rc-expsyn/arbor-rc-expsyn.cpp
+++ b/validation/src/arbor-rc-expsyn/arbor-rc-expsyn.cpp
@@ -63,7 +63,7 @@ struct rc_expsyn_recipe: public arb::recipe {
     }
 
     probe_info get_probe(cell_member_type id) const override {
-        return probe_info{id, 0, cell_probe_address{soma_centre(), cell_probe_address::membrane_voltage}};
+        return probe_info{id, 0, cell_probe_membrane_voltage{soma_centre()}};
     }
 
     std::vector<event_generator> event_generators(cell_gid_type) const override {