diff --git a/src/code.cpp b/src/code.cpp
index 427b94e..f0b6749 100644
--- a/src/code.cpp
+++ b/src/code.cpp
@@ -1,9 +1,41 @@
 #include "code.h"
 
+#include <regex>
+#include <iterator>
+#include <algorithm>
+#include <iostream>
+
 namespace SELCAL {
 
 Code::Code(std::string s) : code(s) {
+    std::transform(s.begin(), s.end(), s.begin(), ::toupper);
+    std::regex pattern(
+        "([0-9A-Z]{" + std::to_string(KEYS_PER_GROUP) + "})"
+        + GROUP_SEPARATOR +
+        "([0-9A-Z]{" + std::to_string(KEYS_PER_GROUP) + "})"
+    );
 
+    std::smatch match;
+    if (std::regex_match(s, match, pattern)) {
+        // The first match[0] is always the entire string for a successful match
+        for (std::size_t i = 1; i < match.size(); ++i) {
+            std::ssub_match sub_match = match[i];
+            std::string piece = sub_match.str();
+
+            Group group;
+            std::transform(piece.begin(), piece.end(), group.begin(), [](char c) {
+                return static_cast<Key>(c);
+            });
+            groups.push_back(group);
+        }
+    }
+    else {
+        throw new std::runtime_error("Could not parse SELCAL");
+    }
+}
+
+const std::vector<Group>& Code::getGroups() const {
+    return groups;
 }
 
 bool Code::isValid() const {
diff --git a/src/code.h b/src/code.h
index ed3609d..7a3c061 100644
--- a/src/code.h
+++ b/src/code.h
@@ -51,11 +51,13 @@ class Code {
 public:
     Code(std::string s);
 
+    const std::vector<Group>& getGroups() const;
+
 private:
     bool isValid() const;
 
     const std::string code;
-    const std::vector<Group> groups;
+    std::vector<Group> groups;
 };
 
 } // SELCAL
diff --git a/src/main.cpp b/src/main.cpp
index eecf55d..ee75fd0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,6 +10,16 @@
 
 int main(int argc, char** argv) {
 
+    SELCAL::Code code{"A5-CD"};
+
+    for (auto& group : code.getGroups()) {
+        std::cout
+            << magic_enum::enum_name(group[0]) << " + "
+            << magic_enum::enum_name(group[1])
+            << std::endl;
+    }
+
+
     Synth synth;
 
     for(int i = 1; i < argc; ++i) {
@@ -21,7 +31,7 @@ int main(int argc, char** argv) {
             << ":(" << program.bankNumber << ", " << program.programNumber << ")"
             << std::endl;
 
-        if (program.name == "Tuba") {
+        if (program.name == "Square Wave") {
             std::cout << "Loading program!" << std::endl;
             synth.loadProgram(program);
         }
@@ -67,41 +77,51 @@ int main(int argc, char** argv) {
 
 
     for (auto pair : keyFrequencies) {
-        std::cout
-            << magic_enum::enum_name(pair.first) << " = "
-            << pair.second << " Hz "
-            << " or MIDI key " << frequencyToMidi(pair.second)
-            << std::endl;
-
         // fluidsynth wants tunings in MIDI cents, which effectively means MIDI key * 100.
         // As we only care about the SELCAL 32 tones, only tune those specific keys. We don't
         // need to tune the full 128-key keyboard.
         constexpr double MIDI_CENT_SCALE = 100.0;
         const int keyIndex = static_cast<int>(pair.first);
-        tunings[keyIndex] = frequencyToMidi(pair.second * MIDI_CENT_SCALE);
+        tunings[keyIndex] = frequencyToMidi(pair.second) * MIDI_CENT_SCALE;
+
+        std::cout
+            << magic_enum::enum_name(pair.first) << " = "
+            << pair.second << " Hz "
+            << " or MIDI key " << frequencyToMidi(pair.second) * MIDI_CENT_SCALE
+            << std::endl;
     }
 
-    bool success = synth.setTuning(tunings);
-    std::cout << "Set tuning: " << (success ? "success" : "failed") << std::endl;
-
-
     fluid_synth_t* raw_synth = synth.getSynth();
+    constexpr int ALL_CHANNELS = -1;
+    bool success;
     using namespace std::chrono_literals;
 
-    int i, key;
-    for(i = 0; i < 12; i++)
-    {
-        /* Generate a random key */
-        key = 30 + (int)(12.0f * rand() / (float) RAND_MAX);
 
-        /* Play a note */
-        fluid_synth_noteon(raw_synth, 0, key, 100);
+    success = synth.setTuning(tunings);
+    std::cout << "Set tuning: " << (success ? "success" : "failed") << std::endl;
 
-        /* Sleep for 1 second */
+    for (auto& group : code.getGroups()) {
+        fluid_synth_noteon(raw_synth, 0, static_cast<int>(group[0]), 100);
+        fluid_synth_noteon(raw_synth, 1, static_cast<int>(group[1]), 100);
         std::this_thread::sleep_for(1s);
 
-        /* Stop the note */
-        fluid_synth_noteoff(raw_synth, 0, key);
+        // Silence between tone groups
+        fluid_synth_all_notes_off(raw_synth, ALL_CHANNELS);
+        std::this_thread::sleep_for(200ms);
     }
 
+    /*
+    success = synth.resetTuning();
+    std::cout << "Set tuning: " << (success ? "success" : "failed") << std::endl;
+
+    for (auto& group : code.getGroups()) {
+        fluid_synth_noteon(raw_synth, 0, static_cast<int>(group[0]), 100);
+        fluid_synth_noteon(raw_synth, 1, static_cast<int>(group[1]), 100);
+        std::this_thread::sleep_for(1s);
+
+        // Silence between tone groups
+        fluid_synth_all_notes_off(raw_synth, ALL_CHANNELS);
+        std::this_thread::sleep_for(200ms);
+    }
+    */
 }
diff --git a/src/synth.cpp b/src/synth.cpp
index 112ef27..22e4277 100644
--- a/src/synth.cpp
+++ b/src/synth.cpp
@@ -77,6 +77,11 @@ bool Synth::setTuning(const std::array<double, NUM_MIDI_NOTES>& pitches) {
         1
     );
 
+    if (result == FLUID_OK) {
+        result = fluid_synth_activate_tuning(synth, 0, 0, 0, 1);
+        result = fluid_synth_activate_tuning(synth, 1, 0, 0, 1);
+    }
+
     return result == FLUID_OK;
 }