diff --git a/README.md b/README.md
index 30189c7..596f4dd 100644
--- a/README.md
+++ b/README.md
@@ -50,4 +50,4 @@ bindel = SHIFT,XF86AudioLowerVolume, exec, volbash down --bypass
 
 ## License
 
-[MIT license](./LICENSE)
+[MIT License](./LICENSE)
diff --git a/volbash b/volbash
index f1ed548..46dd46c 100755
--- a/volbash
+++ b/volbash
@@ -25,12 +25,15 @@
 
 set -eEo pipefail
 
-SOURCE="@DEFAULT_AUDIO_SINK@"
+VERSION="1.0"
+
+OUTPUT="@DEFAULT_AUDIO_SINK@"
+SOURCE="@DEFAULT_AUDIO_SOURCE@"
 
 main() {
+    local action bypass
+    local sink="$OUTPUT"
     local delta=5
-    local action=
-    local bypass=
 
     while (($#)); do
         case $1 in
@@ -38,7 +41,7 @@ main() {
             bypass=1
             ;;
         --source | -s)
-            SOURCE="@DEFAULT_AUDIO_SOURCE@"
+            sink="$SOURCE"
             ;;
         --delta | -d)
             shift
@@ -62,55 +65,50 @@ main() {
 
     case $action in
     up | down)
-        adjust "$action" "$delta" "$bypass"
+        adjust "$delta"
         ;;
-    mute | unmute)
-        toggle "$action"
-        ;;
-    toggle)
+    mute | unmute | toggle)
         toggle
         ;;
     *)
-        invalid_option "$action"
+        invalid_option
         ;;
     esac
 }
 
 toggle() {
-    if [[ -z $1 ]]; then
-        wpctl set-mute "$SOURCE" toggle
+    if [[ -z $action ]]; then
+        wpctl set-mute "$sink" toggle
     else
-        wpctl set-mute "$SOURCE" "$([[ "$1" == "mute" ]] && echo 1 || echo 0)"
+        wpctl set-mute "$sink" "$([[ "$action" == "mute" ]] && echo 1 || echo 0)"
     fi
 }
 
 adjust() {
-    local vol=
-    local op=
-    local delta=
+    local delta vol op 
 
     # Check for valid input value
-    case $2 in '' | *[!0-9]*)
+    case $1 in '' | *[!0-9]*)
         echo "error: Delta value must be a positive integer."
         exit 2
         ;;
     esac
 
     # Ascertain the volume level by parsing wpctl's output
-    vol=$(v="$(wpctl get-volume "$SOURCE")"; echo "${v#* }")
+    vol=$(v="$(wpctl get-volume "$sink")"; echo "${v#* }")
     vol=$([[ ${vol%.*} -gt 0 ]] && echo "${vol%.*}" || echo)${vol#*.}
 
     # Designate an arithmetic operator for the operation
-    op=$([[ "$1" == "up" ]] && echo "+" || echo "-")
-    delta="${2}%$op"
+    op=$([[ "$action" == "up" ]] && echo "+" || echo "-")
+    delta="${1}%$op"
 
-    # We check if the volume increment exceeds 100 and override 
+    # Check if the volume increment exceeds 100 and override
     # the delta if the bypass option has not been specified.
-    if [[ -z $3 ]] && [[ $(("$vol" "$op" "$2")) -gt 100 ]]; then
+    if [[ -z $bypass ]] && [[ $(("$vol" "$op" "$1")) -gt 100 ]]; then
         delta="100%"
     fi
 
-    wpctl set-volume "$SOURCE" "$delta"
+    wpctl set-volume "$sink" "$delta"
 }
 
 invalid_option() {
@@ -125,7 +123,7 @@ invalid_option() {
 }
 
 version() {
-    echo -e "volbash 1.0 - simple wpctl wrapper
+    echo -e "volbash $VERSION - simple wpctl wrapper
 Copyright (C) 2025 Xavier Moffett\n
 Licensed under the MIT License\n"
     exit