diff --git a/src/music_visualizer.c b/src/music_visualizer.c
index 3ed02d1..ec6a90e 100644
--- a/src/music_visualizer.c
+++ b/src/music_visualizer.c
@@ -224,7 +224,9 @@
         wrefresh(mainwin);
 
         if(subWindow) {
+            print_subw(sub, beat, maxR/2, maxC/2);
             box(sub, 0, 0);
+
             wrefresh(sub);
 
             // refresh sub window
diff --git a/src/utils_curses.c b/src/utils_curses.c
index 0a9fcaf..c01b09f 100644
--- a/src/utils_curses.c
+++ b/src/utils_curses.c
@@ -125,6 +125,32 @@
 }
 
 void
+print_subw(WINDOW* sub, const bool beat, const int maxR, const int maxC)
+{
+    int row, col;
+    int color = 5;
+
+	int rr = genrand_int32() % maxR;
+
+	for (row=0; row<maxR; ++row) {
+        for(col=0; col < maxC; ++col) {
+            if(beat &&
+               row <= rr+maxR/4 && row >= rr-maxR/4 ) {
+                mvwaddch(sub, row, col, '#');
+			} else {
+                if(col % 2 == 0) {
+                    mvwaddch(sub, row, col, '.');
+                } else {
+                    mvwaddch(sub, row, col, '`');
+                }
+            }
+        }
+	}
+    if(beat) mvprintw(maxR/2, maxC/2, "* CLAP *");
+
+}
+
+void
 print_help(const int maxR, const int maxC)
 {
 	erase();
diff --git a/src/utils_curses.h b/src/utils_curses.h
index fef4293..c0f466a 100644
--- a/src/utils_curses.h
+++ b/src/utils_curses.h
@@ -9,6 +9,7 @@
 void init_color_pairs();
 WINDOW* curses_init();
 void print_col(int col, int length, const int maxR, const int maxC, PATTERN pattern, int seed);
+void print_subw(WINDOW* sub, const bool beat, const int maxR, const int maxC);
 void print_rate_info(const int rate, const int nsamples, const int maxC, int seed, const bool beat);
 void print_help(const int maxR, const int maxC);