I'll create a Python script that converts audio files to WAV format while preserving directory structure. This script will use the `pydub` library for audio conversion.I've created a comprehensive Python script that converts audio files to WAV format with the features you requested. Here's what the script does:

## Key Features:
- **Supported formats**: WAV, OGG, FLAC, MP3, MP4
- **Directory structure preservation**: Mirrors the input directory structure in the output directory
- **Configurable output**: Specify sample rate and number of channels (mono/stereo)
- **Recursive search**: Finds audio files in all subdirectories
- **Progress tracking**: Shows conversion progress with optional verbose mode

## Usage Examples:

**Basic usage:**
```bash
python audio_converter.py /path/to/input /path/to/output
```

**With custom sample rate and mono output:**
```bash
python audio_converter.py /path/to/input /path/to/output -r 48000 -c 1
```

**With verbose output:**
```bash
python audio_converter.py /path/to/input /path/to/output -v
```

## Requirements:
You'll need to install the `pydub` library:
```bash
pip install pydub
```

For MP3 support, you might also need:
```bash
pip install pydub[mp3]
```

## Command Line Options:
- `input_dir`: Source directory containing audio files
- `output_dir`: Destination directory for WAV files
- `-r, --sample-rate`: Output sample rate in Hz (default: 44100)
- `-c, --channels`: Number of channels - 1 (mono) or 2 (stereo) (default: 2)
- `-v, --verbose`: Enable detailed output during conversion

The script includes error handling for unsupported files, missing directories, and conversion failures. It will create the output directory structure as needed and provide a summary of successful and failed conversions.