I can now load a json config file name .tarpit.json to configure everything. It now works to configure the sounds used.

jsontest.cpp

@@ -0,0 +1,27 @@
+#include <iostream>
+#include <fstream>
+#include <fmt/core.h>
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+using namespace fmt;
+using namespace std;
+
+int main(int argc, char *argv[]) {
+  if(argc != 2) {
+    println("USAGE: jsontest [jsonfile]");
+    return 0;
+  }
+
+  ifstream infile(argv[1]);
+  json data = json::parse(infile);
+
+  json::string_t s2 = data["happy"].template get<std::string>();
+
+  for(auto &el : data.items()) {
+    cout << el.key() << "=" << el.value() << "\n";
+  }
+
+  println("DATA HAPPY {}", s2);
+  return 0;
+}