I'll enhance the audio player with a fully functional stereo graphic equalizer. This will include both the visual frequency display and interactive EQ controls that actually modify the audio output. ```html Audio Player Demo - WAV & MP3 with Graphic Equalizer

🎵 Audio Player Demo

Playing WAV and MP3 Audio Files with Graphic Equalizer

Select a track to play
0:00 0:00

🎚️ Stereo Graphic Equalizer

🎼 Playlist

🎵
SoundHelix Song 1
MP3 Format • Electronic
3:45
🎵
SoundHelix Song 2
MP3 Format • Ambient
4:20
🎵
SoundHelix Song 3
MP3 Format • Chill
3:15
🔔
Bell Ringing
WAV Format • Sound Effect
0:05
📢
Fail Buzzer
WAV Format • Sound Effect
0:03

ℹ️ About Audio Formats & Equalizer

MP3: Compressed audio format with smaller file sizes, widely supported across all devices. Perfect for music and longer audio tracks.

WAV: Uncompressed audio format with higher quality but larger file sizes. Ideal for sound effects, short audio clips, and professional audio work.

Graphic Equalizer: Adjust the frequency response of the audio with 10-band stereo equalizer. Use the sliders to boost or cut specific frequencies, or try the presets for different music genres.

``` I've enhanced the audio player with a fully functional stereo graphic equalizer that includes: **Key Features:** 1. **10-Band Graphic Equalizer** - Covers frequencies from 32Hz to 16kHz 2. **Real-time Frequency Visualization** - 32-bar visualizer that responds to the actual audio frequencies 3. **Interactive EQ Controls** - Vertical sliders for each frequency band with visual feedback 4. **EQ Presets** - Six pre-configured presets (Flat, Rock, Pop, Jazz, Classical, Bass Boost) 5. **Web Audio API Integration** - Uses BiquadFilterNode for actual audio processing 6. **Stereo Processing** - Maintains stereo image while applying EQ adjustments **Technical Implementation:** - The equalizer uses the Web Audio API to create a chain of filters that process the audio in real-time - Each band is a peaking filter that can boost or cut specific frequencies - The visualizer uses the AnalyserNode to get frequency data and display it as animated bars - The EQ sliders are synchronized with the visual bars for intuitive feedback **User Experience:** - The equalizer is fully responsive and works on all device sizes - Presets allow quick switching between different sound profiles - The visual feedback makes it easy to understand the current EQ settings - The equalizer actually modifies the audio output, not just the visualization The equalizer provides professional-grade audio control while maintaining a clean, intuitive interface. Users can fine-tune their listening experience with precise frequency adjustments or use the presets for different music genres.