diff --git a/gaboshlib/g_num_is_between.sh b/gaboshlib/g_num_is_between.sh
index 042a19f..302fcaf 100644
--- a/gaboshlib/g_num_is_between.sh
+++ b/gaboshlib/g_num_is_between.sh
@@ -1,47 +1,54 @@
-function g_num_is_between {
+function g_calc {
 
-  local f_num=$1
-  local f_between1=$2
-  local f_between2=$3
-
-  # Check for integer (can be done with bash itself)
-  if [[ ${f_num} =~ ^[0-9]+$ ]] && [[ ${f_between1} =~ ^[0-9]+$ ]] && [[ ${f_between2} =~ ^[0-9]+$ ]]
+  # Use bc in backround for multiple bc's running much faster
+  if [ -z "${g_bc_running}" ]
   then
-    # Check which is the low (from) and the high (to) number
-    if [ "${f_between1}" -lt "${f_between2}" ]
-    then
-      local f_from=${f_between1}
-      local f_to=${f_between2}
-    else
-      local f_from=${f_between2}
-      local f_to=${f_between1}
-    fi
-    # Check if given number is in or out range
-    if [ ${f_num} -lt ${f_from} ] || [ ${f_num} -gt ${f_to} ]
-    then
-      return 1
-    else
-      return 0
-    fi
-  fi
+    g_rnd=$RANDOM
+    mkdir -p ${g_tmp}/${g_rnd}
+    [ -p ${g_tmp}/${g_rnd}/bc-in ] || mkfifo ${g_tmp}/${g_rnd}/bc-in
+    [ -p ${g_tmp}/${g_rnd}/bc-out ] || mkfifo ${g_tmp}/${g_rnd}/bc-out
+    [ -p ${g_tmp}/${g_rnd}/bc-sed-in ] || mkfifo ${g_tmp}/${g_rnd}/bc-sed-in
+    [ -p ${g_tmp}/${g_rnd}/bc-sed-out ] || mkfifo ${g_tmp}/${g_rnd}/bc-sed-out
 
-  # Check for valid number
-  g_num_valid_number "$f_num" "$f_between1" "$f_between2" || return 1
+    # bc stream channel
+    { bc -ql <${g_tmp}/${g_rnd}/bc-in 2>&1 >${g_tmp}/${g_rnd}/bc-out & } 2>/dev/null
+    exec 3>${g_tmp}/${g_rnd}/bc-in 4<${g_tmp}/${g_rnd}/bc-out
 
-  # Check which is the low (from) and the high (to) number
-  if [ $(g_calc "${f_between1} < ${f_between2}") -ne 0 ]
-  then
-    local f_from=${f_between1}
-    local f_to=${f_between2}
-  else
-    local f_from=${f_between2}
-    local f_to=${f_between1}
-  fi
-  # Check if given number is in or out range
-  if [ $(g_calc "${f_num} < ${f_from}") -ne 0 ] || [ $(g_calc "${f_num} > ${f_to}") -ne 0 ] 
+    # sed stream channel
+    { sed -su 's/^\./0./; s/^-\./-0./' <${g_tmp}/${g_rnd}/bc-sed-in >${g_tmp}/${g_rnd}/bc-sed-out & } 2>/dev/null
+    exec 5>${g_tmp}/${g_rnd}/bc-sed-in 6<${g_tmp}/${g_rnd}/bc-sed-out
+
+    g_bc_running="true"
+  fi 
+
+  # do bc
+  echo "scale=8; $@" >&3
+  local g_bc_out
+  if ! read -t 0.1 g_bc_out <&4
   then
+    g_traceback "$@"
+    ( exec 3<&- ) 2>/dev/null
+    ( exec 4<&- ) 2>/dev/null
+    ( exec 5<&- ) 2>/dev/null
+    ( exec 6<&- ) 2>/dev/null
+    unset g_bc_running
+    return 1
+  fi 
+
+  # do sed
+  echo ${g_bc_out} >&5
+  local g_sed_out
+  if ! read -t 0.1 g_sed_out <&6
+  then
+    g_traceback "$@"
+    ( exec 3<&- ) 2>/dev/null
+    ( exec 4<&- ) 2>/dev/null
+    ( exec 5<&- ) 2>/dev/null
+    ( exec 6<&- ) 2>/dev/null
+    unset g_bc_running
     return 1
-  else
-    return 0
   fi
+
+  # echo result
+  echo ${g_sed_out}
 }