diff --git a/src/soundsourcemp3.cpp b/src/soundsourcemp3.cpp
index 37b01d9..679a558 100644
--- a/src/soundsourcemp3.cpp
+++ b/src/soundsourcemp3.cpp
@@ -663,12 +663,23 @@ int SoundSourceMp3::findFrame(int pos)
 
 inline signed int SoundSourceMp3::madScale(mad_fixed_t sample)
 {
+    static int min = 0, max = 0;
+    static int row = 0, max_row = 0;
+
     sample += (1L << (MAD_F_FRACBITS - 16));
 
-    if (sample >= MAD_F_ONE)
+    if (sample >= MAD_F_ONE) {
+        if (max < sample) max = sample;
+        if(++row > max_row) max_row = row;
         sample = MAD_F_ONE - 1;
-    else if (sample < -MAD_F_ONE)
+
+    } else if (sample < -MAD_F_ONE) {
+        if (min > sample) min = sample;
+        if(++row > max_row) max_row = row;
         sample = -MAD_F_ONE;
+    } else {
+        row = 0;
+    }
 
     return sample >> (MAD_F_FRACBITS + 1 - 16);
 }