Fixed the issue with space and enter not working to advance notes. Thanks @mwtab@2mb.social. Added 12 string for both 1 step down adn standard tunings. Added Mandolin.

bashtuner.sh

@@ -8,13 +8,18 @@ declare -A tuning=(
   [6d]="D2 G2 C3 F3 A3 D4"
   # Standard tuning
   [6e]="E2 A2 D3 G3 B3 E4"
+  # 12 string dropped 1 step.
+  [12d]="D2 D3 G2 G3 C3 C4 F3 F4 A3 D4"
+  # 12 string standard tuning
+  [6e]="E2 E3 A2 A3 D3 D4 G3 G4 B3 E4"
+  # Mandolin
+  [mandolin]="G3 D4 A4 E5"
 )
 
 show_help() {
   echo "Usage: $0 tune_id"
   echo "Where tune_id is one of"
   echo "${!tuning[@]}"
-  echo "To advance to the next note, press any letter, enter and space do not work."
 exit 0
 }
 
@@ -29,10 +34,13 @@ exit 0
 timeout=2
 for i in ${tuning[$1]} ; do
   unset continue
+  ifs="$IFS"
+  IFS=""
   while [[ -z "$continue" ]]; do
     ps $notePID &> /dev/null && kill $notePID &> /dev/null
     play -qnV0 synth $timeout pl $i &
     notePID="$!"
-    read -sn1 -t $timeout continue
+    read -sN1 -t $timeout continue
   done
+  IFS="$ifs"
 done