power shell script to get audio file data from folder having subfolders.

Hi All,

I have a folder inside this folder I have around 20 sub folders, each sub folder having .wav files and I have a power shell script using this script I am able to get data from a single folder, but I want to get data from all sub folders in one go. Below is my power shell script. How to make this script to loop through each folder.
Below is my script which I have try.

Show an Open Folder Dialog and return the directory selected by the user.

function Read-FolderBrowserDialog([string]$Message, [string]$InitialDirectory, [switch]$NoNewFolderButton)
$browseForFolderOptions = 0
if ($NoNewFolderButton) { $browseForFolderOptions += 512 }

$app = New-Object -ComObject Shell.Application
$folder = $app.BrowseForFolder(0, $Message, $browseForFolderOptions, $InitialDirectory)
if ($folder) { $selectedDirectory = $folder.Self.Path } else { $selectedDirectory = '' }
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($app) > $null
return $selectedDirectory

$folder= Read-FolderBrowserDialog
$com = (New-Object -ComObject Shell.Application).NameSpace($folder)
for($i = 0; $i -lt 64; $i++) {
$name = $com.GetDetailsOf($com.Items, $i)
if ($name -eq ‘Length’) { $lengthattribute = $i}
$com.Items() |
ForEach-Object {
Name = $.Name
Path = $
Size = $com.GetDetailsOf($, 1)
DateCreated = $com.GetDetailsOf($
, 4)
Length = $com.GetDetailsOf($_, $lengthattribute)
} |
Export-csv report.csv -notypeinformation

I wonder if this could be of any help to you.