diff --git a/src/controller/model_utils/signal_reducer.rs b/src/controller/model_utils/signal_reducer.rs
index bee4d47..590e569 100644
--- a/src/controller/model_utils/signal_reducer.rs
+++ b/src/controller/model_utils/signal_reducer.rs
@@ -33,3 +33,19 @@ pub fn coef_of_signal_reduce(Vs: f64, V: f64) -> f64 {
         Vs / V
     }
 }
+
+pub fn set_default_values(model: &ListStore) {
+    for number in (0..=100).step_by(5) {
+        if number == 0 {
+            model.append(&Frequency::new(1.0));
+        } else if (number >= 70 && number % 10 == 0) || (number < 70 && number % 5 == 0) {
+            model.append(&Frequency::new(number as f64));
+        }
+    }
+}
+
+pub fn find_by_frequency_value(model: &ListStore, new_elem: &Frequency) -> Option<u32> {
+    model.find_with_equal_func(|elem| {
+        elem.downcast_ref::<Frequency>().unwrap().frequency() == new_elem.frequency()
+    })
+}
diff --git a/src/view/pages/signal_reducing.rs b/src/view/pages/signal_reducing.rs
index 99eb946..69d0530 100644
--- a/src/view/pages/signal_reducing.rs
+++ b/src/view/pages/signal_reducing.rs
@@ -66,13 +66,7 @@ pub fn signal_reducing_page(wrapper: &Box) {
 
     let model_for_events = model.clone();
 
-    for number in (0..=100).step_by(5) {
-        if number == 0 {
-            model.append(&Frequency::new(1.0));
-        } else if (number >= 70 && number % 10 == 0) || (number < 70 && number % 5 == 0) {
-            model.append(&Frequency::new(number as f64));
-        }
-    }
+    set_default_values(&model);
 
     let numeric_sorter = CustomSorter::new(|a, b| {
         let a = a.downcast_ref::<Frequency>().unwrap().frequency();