diff --git a/.chatgpt_config.yaml b/.chatgpt_config.yaml
index a4d370c..01e37a9 100644
--- a/.chatgpt_config.yaml
+++ b/.chatgpt_config.yaml
@@ -2,3 +2,5 @@ project_name: "soundscape-sync"
 default_prompt_blocks:
   - "basic-prompt"
   - "go-development"
+initial_files:
+  - "README.md"
diff --git a/.gitignore b/.gitignore
index f8c8ca3..2e5c3d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-./fyne-cross
+fyne-cross
 ./soundscape-sync
diff --git a/FyneApp.toml b/FyneApp.toml
index 2d8cc27..e138606 100644
--- a/FyneApp.toml
+++ b/FyneApp.toml
@@ -1,6 +1,6 @@
 [Details]
-Icon = "Icon.png"
-Name = "SoundscapeSync"
-ID = "com.cloonar.soundscape-sync"
-Version = "0.0.1"
-Build = 1
+  Icon = "Icon.png"
+  Name = "SoundscapeSync"
+  ID = "com.cloonar.soundscape-sync"
+  Version = "0.0.1"
+  Build = 2
diff --git a/README.md b/README.md
index aa34a4a..211e123 100644
--- a/README.md
+++ b/README.md
@@ -18,9 +18,6 @@ It is important that both folders have the same amount of Files and that the fil
 - [x] Make it possible to Sync with spatial Audio Soundscapes
 - [ ] Make it usable with Mac
 - [ ] Generate a package for Ubuntu
-- [ ] Better handling of file mapping
-- [x] add cover art for mp3
-- [x] add cover art for m4b
 - [x] load metadata from audiobook
 
 ## Support Me
diff --git a/internal/logic/sync-5.1.go b/internal/logic/sync-5.1.go
index d678421..c91f636 100644
--- a/internal/logic/sync-5.1.go
+++ b/internal/logic/sync-5.1.go
@@ -1,12 +1,10 @@
 package logic
 
-func get5_1Arguments() []string {
+import "fmt"
+
+func get5_1Arguments(volume float64) []string {
       return []string{
-          // best audio format so far on ios
-          "-filter_complex", "[1:a]apad[a2];[0:a][a2]amerge=inputs=2[out]",
+          "-filter_complex", fmt.Sprintf("[0:a]volume=%f,apad[a2];[1:a][a2]amerge=inputs=2[out]", volume),
           "-c:a", "aac", "-b:a", "654k",
-          // mp4 output
-          // "-filter_complex", "[1:a]apad[a2];[0:a][a2]amerge=inputs=2,pan=5.1|c0=c0+c6|c1=c1+c7|c2=c2|c3=c3|c4=c4|c5=c5[out]",
-          // "-c:a", "eac3", "-ac", "6",
       }
 }
diff --git a/internal/logic/sync-7.1.2.go b/internal/logic/sync-7.1.2.go
index 5b852d7..55ab759 100644
--- a/internal/logic/sync-7.1.2.go
+++ b/internal/logic/sync-7.1.2.go
@@ -1,8 +1,10 @@
 package logic
 
-func get7_1_2Arguments() []string {
+import "fmt"
+
+func get7_1_2Arguments(volume float64) []string {
       return []string{
           "-filter_complex",
-          "[1:a]apad[a2];[0:a][a2]amerge=inputs=2,pan=7.1.2|FL=c0+c10|FR=c1+c11|FC=c2|LFE=c3|BL=c6|BR=c7|SL=c4|SR=c5|TFL=c8|TFR=c9[out]",
+          fmt.Sprintf("[0:a]volume=%f,apad[a2];[1:a][a2]amerge=inputs=2,pan=7.1.2|FL=c0+c10|FR=c1+c11|FC=c2|LFE=c3|BL=c6|BR=c7|SL=c4|SR=c5|TFL=c8|TFR=c9[out]", volume),
       }
 }
diff --git a/internal/logic/sync-7.1.4.go b/internal/logic/sync-7.1.4.go
index 2906f3c..8259109 100644
--- a/internal/logic/sync-7.1.4.go
+++ b/internal/logic/sync-7.1.4.go
@@ -1,8 +1,10 @@
 package logic
 
-func get7_1_4Arguments() []string {
+import "fmt"
+
+func get7_1_4Arguments(volume float64) []string {
       return []string{
           "-filter_complex",
-          "[1:a]apad[a2];[0:a][a2]amerge=inputs=2,pan=7.1.4|FL=c0+c12|FR=c1+c13|FC=c2|LFE=c3|BL=c6|BR=c7|SL=c4|SR=c5|TFL=c8|TFR=c9|TBL=c10|TBR=c11[out]",
+          fmt.Sprintf("[0:a]volume=%f,apad[a2];[1:a][a2]amerge=inputs=2,pan=7.1.4|FL=c0+c12|FR=c1+c13|FC=c2|LFE=c3|BL=c6|BR=c7|SL=c4|SR=c5|TFL=c8|TFR=c9|TBL=c10|TBR=c11[out]", volume),
       }
 }
diff --git a/internal/logic/sync-stereo.go b/internal/logic/sync-stereo.go
index 1a4e588..ceef83e 100644
--- a/internal/logic/sync-stereo.go
+++ b/internal/logic/sync-stereo.go
@@ -1,7 +1,9 @@
 package logic
 
-func getStereoArguments() []string {
+import "fmt"
+
+func getStereoArguments(volume float64) []string {
       return []string{
-          "-filter_complex", "[1:a]apad[a2];[0:a][a2]amerge=inputs=2,pan=stereo|c0<c0+c2|c1<c1+c3[out]",
+          "-filter_complex", fmt.Sprintf("[0:a]volume=%f,apad[a2];[1:a][a2]amerge=inputs=2,pan=stereo|c0<c0+c2|c1<c1+c3[out]", volume),
       }
 }
diff --git a/internal/logic/sync.go b/internal/logic/sync.go
index 327c932..bbc074f 100644
--- a/internal/logic/sync.go
+++ b/internal/logic/sync.go
@@ -40,7 +40,10 @@ func getAudioFiles(folder string) ([]string, error) {
     return audioFiles, nil
 }
 
-func CombineFiles(folder1 string, folder2 string, outputFolder string, progress *widget.ProgressBar) error {
+func CombineFiles(folder1 string, folder2 string, outputFolder string, progress *widget.ProgressBar, soundscapeVolume float64) error {
+    // Adjust volume to range [0.5, 1.0]
+    soundscapeVolume = 0.5 + (soundscapeVolume / 100.0 * 0.5)
+
     // Get list of audio files from both folders
     files1, err := getAudioFiles(folder1)
     if err != nil {
@@ -69,11 +72,11 @@ func CombineFiles(folder1 string, folder2 string, outputFolder string, progress
             return err
         }
 
-        channelArguments, err := getChannelArguments(channel)
+        channelArguments, err := getChannelArguments(channel, soundscapeVolume)
         if err != nil {
             return err
         }
-        
+
         // Get output file name
         ext := filepath.Ext(file)
         newFileName := outputFolder + "/" + filepath.Base(files2[index])
@@ -165,16 +168,16 @@ func getBaseArguments() []string {
   }
 }
 
-func getChannelArguments(channels int) ([]string, error) {
+func getChannelArguments(channels int, volume float64) ([]string, error) {
   switch channels {
     case 2:
-      return getStereoArguments(), nil
+      return getStereoArguments(volume), nil
     case 6:
-      return get5_1Arguments(), nil
+      return get5_1Arguments(volume), nil
     case 10:
-      return get7_1_2Arguments(), nil
+      return get7_1_2Arguments(volume), nil
     case 12:
-      return get7_1_4Arguments(), nil
+      return get7_1_4Arguments(volume), nil
   }
   return nil, fmt.Errorf("Currently only stereo, 5.1, 7.1.2 and 7.1.4 Soundscapes are supported")
 }
diff --git a/internal/ui/sysproc_default.go b/internal/ui/sysproc_default.go
new file mode 100644
index 0000000..ddc9b49
--- /dev/null
+++ b/internal/ui/sysproc_default.go
@@ -0,0 +1,10 @@
+//go:build !windows
+// +build !windows
+
+package ui
+
+import "syscall"
+
+func getSysProcAttr() *syscall.SysProcAttr {
+    return &syscall.SysProcAttr{}
+}
\ No newline at end of file
diff --git a/internal/ui/sysproc_windows.go b/internal/ui/sysproc_windows.go
new file mode 100644
index 0000000..0d02487
--- /dev/null
+++ b/internal/ui/sysproc_windows.go
@@ -0,0 +1,16 @@
+//go:build windows
+// +build windows
+
+package ui
+
+import (
+    "syscall"
+)
+
+const CREATE_NO_WINDOW = 0x08000000
+
+func getSysProcAttr() *syscall.SysProcAttr {
+    return &syscall.SysProcAttr{
+        CreationFlags: CREATE_NO_WINDOW,
+    }
+}
\ No newline at end of file
diff --git a/internal/ui/windows.go b/internal/ui/windows.go
index 9ba42ac..8e8d7d9 100644
--- a/internal/ui/windows.go
+++ b/internal/ui/windows.go
@@ -2,12 +2,17 @@ package ui
 
 import (
     _ "embed"
+    "fmt"
     "net/url"
+    "os/exec"
     "path/filepath"
+    "runtime"
+    "strings"
 
     "fyne.io/fyne/v2"
     "fyne.io/fyne/v2/container"
     "fyne.io/fyne/v2/dialog"
+    "fyne.io/fyne/v2/layout"
     "fyne.io/fyne/v2/widget"
 
     "github.com/dpolakovics/soundscape-sync/internal/logic"
@@ -16,78 +21,168 @@ import (
 //go:embed bmc.png
 var bmcPng []byte
 
+func tryLinuxNativeFolderDialog() string {
+    cmd := exec.Command("zenity", "--file-selection", "--directory")
+    out, err := cmd.Output()
+    if err == nil {
+        folderPath := strings.TrimSpace(string(out))
+        if folderPath != "" {
+            return folderPath
+        }
+    }
+
+    cmd = exec.Command("kdialog", "--getexistingdirectory", "$HOME")
+    out, err = cmd.Output()
+    if err == nil {
+        folderPath := strings.TrimSpace(string(out))
+        if folderPath != "" {
+            return folderPath
+        }
+    }
+
+    return ""
+}
+
+func tryNativeFolderDialog() string {
+    switch runtime.GOOS {
+    case "windows":
+        cmd := exec.Command("powershell", "-NoProfile", "-NonInteractive", "-WindowStyle", "Hidden", "-Command",
+            "[System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms') | Out-Null; "+
+                "$ofd = New-Object System.Windows.Forms.OpenFileDialog; "+
+                "$ofd.InitialDirectory = [Environment]::GetFolderPath('MyDocuments'); "+
+                "$ofd.ValidateNames = $true; $ofd.CheckFileExists = $false; $ofd.CheckPathExists = $true; "+
+                "$ofd.FileName = 'Folder Selection.'; "+
+                "if ($ofd.ShowDialog() -eq 'OK') { Split-Path $ofd.FileName }")
+
+        if runtime.GOOS == "windows" {
+            cmd.SysProcAttr = getSysProcAttr()
+        }
+
+        out, err := cmd.Output()
+        if err == nil {
+            folderPath := strings.TrimSpace(string(out))
+            if folderPath != "" {
+                return folderPath
+            }
+        }
+        return ""
+
+    case "darwin":
+        cmd := exec.Command("osascript", "-e", `tell application "System Events" to activate`, "-e", `POSIX path of (choose folder)`)
+        out, err := cmd.Output()
+        if err == nil {
+            folderPath := strings.TrimSpace(string(out))
+            if folderPath != "" {
+                return folderPath
+            }
+        }
+        return ""
+
+    case "linux":
+        return tryLinuxNativeFolderDialog()
+
+    default:
+        return ""
+    }
+}
+
+func showFolderSelection(win fyne.Window, callback func(string)) {
+    nativePath := tryNativeFolderDialog()
+    if nativePath != "" {
+        callback(nativePath)
+        return
+    }
+
+    dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
+        if err != nil {
+            dialog.ShowError(err, win)
+            return
+        }
+        if uri == nil {
+            return
+        }
+        callback(uri.Path())
+    }, win)
+}
+
 func CreateMainContent(app fyne.App, window fyne.Window) fyne.CanvasObject {
     var folder1, folder2, folderOutput string
-    // Create folder selection buttons
-    folder1Button := widget.NewButton("Select the Folder with the Soundscape", nil)
-    folder2Button := widget.NewButton("Select the Folder with the Audiobook", nil)
-    folderOutputButton := widget.NewButton("Select the output Folder", nil)
 
-    // Create labels to display selected folders
+    heading := widget.NewLabelWithStyle("Soundscape Sync", fyne.TextAlignCenter, fyne.TextStyle{Bold: true})
+
     folder1Label := widget.NewLabel("No folder selected")
     folder2Label := widget.NewLabel("No folder selected")
     folderOutputLabel := widget.NewLabel("No folder selected")
 
-    // Create start button
     startButton := widget.NewButton("Start Sync", nil)
-    startButton.Disable() // Disable initially
+    startButton.Disable()
 
-    // Create progress bar
-    progressBar := widget.NewProgressBar()
-    progressBar.Hide() // Hide initially
-
-    // Set up folder selection dialogs
-    folder1Button.OnTapped = func() {
-        dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
-            if err != nil {
-                dialog.ShowError(err, fyne.CurrentApp().Driver().AllWindows()[0])
-                return
-            }
-            if uri == nil {
-                return
-            }
-            folder1 = uri.Path()
-            folder1Label.SetText(filepath.Base(uri.Path()))
+    folder1Button := widget.NewButton("Select the Folder with the Soundscape", func() {
+        showFolderSelection(window, func(path string) {
+            folder1 = path
+            folder1Label.SetText(filepath.Base(path))
             updateStartButton(folder1Label, folder2Label, folderOutputLabel, startButton)
-        }, fyne.CurrentApp().Driver().AllWindows()[0])
-    }
+        })
+    })
 
-    folder2Button.OnTapped = func() {
-        dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
-            if err != nil {
-                dialog.ShowError(err, fyne.CurrentApp().Driver().AllWindows()[0])
-                return
-            }
-            if uri == nil {
-                return
-            }
-            folder2 = uri.Path()
-            folder2Label.SetText(filepath.Base(uri.Path()))
+    folder2Button := widget.NewButton("Select the Folder with the Audiobook", func() {
+        showFolderSelection(window, func(path string) {
+            folder2 = path
+            folder2Label.SetText(filepath.Base(path))
             updateStartButton(folder1Label, folder2Label, folderOutputLabel, startButton)
-        }, fyne.CurrentApp().Driver().AllWindows()[0])
-    }
+        })
+    })
 
-    folderOutputButton.OnTapped = func() {
-        dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
-            if err != nil {
-                dialog.ShowError(err, fyne.CurrentApp().Driver().AllWindows()[0])
-                return
-            }
-            if uri == nil {
-                return
-            }
-            folderOutput = uri.Path()
-            folderOutputLabel.SetText(filepath.Base(uri.Path()))
+    folderOutputButton := widget.NewButton("Select the output Folder", func() {
+        showFolderSelection(window, func(path string) {
+            folderOutput = path
+            folderOutputLabel.SetText(filepath.Base(path))
             updateStartButton(folder1Label, folder2Label, folderOutputLabel, startButton)
-        }, fyne.CurrentApp().Driver().AllWindows()[0])
+        })
+    })
+
+    foldersCard := widget.NewCard(
+        "Folder Selection",
+        "Select input and output folders",
+        container.NewVBox(
+            container.NewHBox(folder1Button, folder1Label),
+            container.NewHBox(folder2Button, folder2Label),
+            container.NewHBox(folderOutputButton, folderOutputLabel),
+        ),
+    )
+
+    volumeSliderValueLabel := widget.NewLabel("Volume: 100%")
+    volumeSlider := widget.NewSlider(50, 100)
+    volumeSlider.Step = 1
+    volumeSlider.Value = 100
+    volumeSlider.OnChanged = func(v float64) {
+        volumeSliderValueLabel.SetText(fmt.Sprintf("Volume: %.0f%%", v))
     }
 
-    // Set up start button action
+    sliderContainer := container.NewGridWrap(fyne.NewSize(400, volumeSlider.MinSize().Height), volumeSlider)
+
+    volumeControls := container.NewVBox(
+        volumeSliderValueLabel,
+        container.NewHBox(
+            sliderContainer,
+            widget.NewLabel("(Default: 100%)"),
+        ),
+    )
+
+    volumeCard := widget.NewCard(
+        "Volume Settings",
+        "Adjust the soundscape volume",
+        volumeControls,
+    )
+
+    progressBar := widget.NewProgressBar()
+    progressBar.Hide()
+
     startButton.OnTapped = func() {
         startButton.Disable()
         progressBar.Show()
         go func() {
-            err := logic.CombineFiles(folder1, folder2, folderOutput, progressBar)
+            err := logic.CombineFiles(folder1, folder2, folderOutput, progressBar, volumeSlider.Value)
             if err != nil {
                 dialog.ShowError(err, window)
             } else {
@@ -97,32 +192,49 @@ func CreateMainContent(app fyne.App, window fyne.Window) fyne.CanvasObject {
             startButton.Enable()
         }()
     }
-    
-    // Create an image for the Buy Me a Coffee button
+
+    actionCard := widget.NewCard(
+        "",
+        "",
+        container.NewVBox(
+            startButton,
+            progressBar,
+        ),
+    )
+
     bmcResource := fyne.NewStaticResource("bmc.png", bmcPng)
-    // Create the Buy Me a Coffee button with an image
     bmcButton := widget.NewButtonWithIcon("Buy me a coffee", bmcResource, func() {
         u, _ := url.Parse("https://www.buymeacoffee.com/razormind")
         _ = app.OpenURL(u)
     })
 
-    // Append new text
-    newText := "I am an individual developer who has created an app for Soundscape synchronization."
-    newText = newText + "\nI hope this app helps you as much as it has helped me."
-    newText = newText + "\nIf you find it useful, please consider buying me a coffee. Thank you!"
-    multiLineEntry := widget.NewMultiLineEntry()
-    multiLineEntry.SetText(newText)
-
-    // Create and return the main content
-    return container.NewVBox(
-        container.NewHBox(folder1Button, folder1Label),
-        container.NewHBox(folder2Button, folder2Label),
-        container.NewHBox(folderOutputButton, folderOutputLabel),
-        startButton,
-        multiLineEntry,
-        bmcButton,
-        progressBar,
+    newText := "I am an individual developer who has created an app for Soundscape synchronization.\n" +
+        "I hope this app helps you as much as it has helped me.\n" +
+        "If you find it useful, please consider buying me a coffee. Thank you!"
+    
+    // Use a label for static text to ensure consistent, visible color
+    aboutLabel := widget.NewLabel(newText)
+    aboutLabel.Wrapping = fyne.TextWrapWord
+
+    supportCard := widget.NewCard(
+        "About & Support",
+        "",
+        container.NewVBox(
+            aboutLabel,
+            bmcButton,
+        ),
     )
+
+    content := container.NewVBox(
+        heading,
+        foldersCard,
+        volumeCard,
+        actionCard,
+        supportCard,
+    )
+
+    outer := container.New(layout.NewPaddedLayout(), content)
+    return outer
 }
 
 func updateStartButton(label1, label2, folderOutputLabel *widget.Label, button *widget.Button) {
diff --git a/shell.nix b/shell.nix
index 02920f6..0659d86 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,16 +1,4 @@
 { pkgs ? import <nixpkgs> {} }:
-# with import <nixpkgs> {
-#   crossSystem = {
-#     config = "x86_64-w64-mingw32";
-#   };
-# };
-# let
-#   # pkgs = (import <nixpkgs>{ crossSystem = {config = "x86_64-w64-mingw32";}; });
-#   pkgs = import <nixpkgs> {
-#     localSystem = "x86_64-linux"; # buildPlatform
-#     crossSystem = "x86_64-w64-mingw32"; # Note the `config` part!
-#   };
-# in
 pkgs.mkShell {
   buildInputs = with pkgs; [
     go
@@ -24,7 +12,7 @@ pkgs.mkShell {
     delve
     pkg-config
     clang
-    pkg-config
+    gcc
     glib
     cairo
     pango
@@ -39,6 +27,7 @@ pkgs.mkShell {
     xorg.libXi
     xorg.libXrandr
     xorg.libXinerama
+    xorg.libXxf86vm
     libxkbcommon
     libGL
     mesa
@@ -53,6 +42,8 @@ pkgs.mkShell {
       pkgs.xorg.libXcursor
       pkgs.xorg.libXi
       pkgs.xorg.libXrandr
+      pkgs.xorg.libXinerama
+      pkgs.xorg.libXxf86vm
       pkgs.libxkbcommon
     ]}:$LD_LIBRARY_PATH
     export GOPATH=$HOME/go