added the readme

Sound.cpp

@@ -0,0 +1,87 @@
+#include "Sound.h"
+#include "common.h"
+
+Sound::Sound()
+{
+    pos = { 0.0f, 0.0f, 0.0f };
+    m_soundData = nullptr;
+    m_channel = nullptr;
+}
+
+Sound::~Sound()
+{
+    StopTrack();
+    // SoundSystem owns the SoundData lifetime — don't delete m_soundData here.
+}
+
+// ---------------------------------------------------------------------------
+// LoadSound
+// Delegates to SoundSystem's cache so the same file is never loaded twice.
+// ---------------------------------------------------------------------------
+void Sound::LoadSound(const std::string& filename, bool is3D)
+{
+    StopTrack();
+    m_soundData = soundsystem->LoadSound(filename, is3D);
+    if (!m_soundData)
+        std::cout << "Sound::LoadSound — failed to load: " << filename << "\n";
+    else if (is3D)
+        m_soundData->sound->set3DMinMaxDistance(minDistance, maxDistance);
+}
+
+// ---------------------------------------------------------------------------
+// PlayTrack
+// ---------------------------------------------------------------------------
+bool Sound::PlayTrack(bool loop)
+{
+    if (!m_soundData || !m_soundData->sound) {
+        std::cout << "Sound::PlayTrack — no sound loaded\n";
+        return false;
+    }
+
+    if (m_soundData->is3D) {
+        m_channel = soundsystem->PlaySound3D(m_soundData, pos, loop);
+    }
+    else {
+        m_channel = soundsystem->PlaySound(m_soundData, loop);
+    }
+
+    return m_channel != nullptr;
+}
+
+// ---------------------------------------------------------------------------
+// StopTrack
+// ---------------------------------------------------------------------------
+bool Sound::StopTrack()
+{
+    if (!m_channel) return true;
+
+    bool isPlaying = false;
+    m_channel->isPlaying(&isPlaying);
+    if (isPlaying)
+        m_channel->stop();
+
+    m_channel = nullptr;
+    return true;
+}
+
+// ---------------------------------------------------------------------------
+// Update3DPosition
+// Call every frame for moving emitters.
+// ---------------------------------------------------------------------------
+void Sound::Update3DPosition(float x, float y, float z)
+{
+    pos = { x, y, z };
+
+    // If channel is still active, push the new position immediately.
+    if (m_channel) {
+        bool isPlaying = false;
+        m_channel->isPlaying(&isPlaying);
+        if (isPlaying) {
+            // Velocity estimated as zero — pass your actual velocity if you have it.
+            soundsystem->SetChannelPosition(m_channel, pos);
+        }
+        else {
+            m_channel = nullptr; // channel finished, clean up handle
+        }
+    }
+}