diff --git a/Modules/.gitignore b/Modules/.gitignore
index 2ebf16d..9c70321 100644
--- a/Modules/.gitignore
+++ b/Modules/.gitignore
@@ -3,6 +3,8 @@ chkpixels
 twavm
 trnd
 
+datas/
+
 *.pgm
 *.pnm
 *.png
diff --git a/Modules/Makefile b/Modules/Makefile
index 70af2ea..f320092 100644
--- a/Modules/Makefile
+++ b/Modules/Makefile
@@ -6,7 +6,7 @@
 
 GFOPT  =  -Wall -Wextra -g -I.
 
-all:	chkpixels trnd
+all:	chkpixels trnd twavm
 
 # ---------------------------------------------------------
 
diff --git a/Modules/twavm.f90 b/Modules/twavm.f90
index 40a47e2..1169e40 100644
--- a/Modules/twavm.f90
+++ b/Modules/twavm.f90
@@ -1,4 +1,4 @@
-program essai
+program twavm
 
   ! new: Wed Feb  7 01:27:48 UTC 2024
 
@@ -6,9 +6,9 @@ program essai
   use wavmetrics
   implicit none
 
-  write(0, *)   "----------------- essai -------------------"
+  write(0, *)   "----------------- twavm -------------------"
 
-  call run_first_test(44100/30)
+  call run_second_test(44100/30)
  
 contains
 !-----------------------------------------------------------------------
@@ -35,5 +35,33 @@ subroutine run_first_test(nbs)
 
 end subroutine
 !-----------------------------------------------------------------------
+!-----------------------------------------------------------------------
+!-
+!-  we read the datas from stdin
+!-
+subroutine run_second_test(nbs)
+  integer, intent(in)   :: nbs                ! nombre d'echantillons
 
+  type(intsample), allocatable     :: samples(:)
+  type(wavmetric)                  :: metrics
+  integer                          :: foo, bar
+  integer                          :: vl, vr
+
+  write(0, '(1X, "second test on ", I0, " samples.")') nbs
+
+! create the buffer, and fill it with stdin
+  allocate(samples(nbs))
+  do foo=1, nbs
+    read(5, *) vl, vr
+    ! print '(1X, 2I16)', vl, vr
+    samples(foo)%left   = vl
+    samples(foo)%right  = vr
+  enddo
+
+! compute and display the metrics (gi-go)
+  call compute_wavmetric(samples, nbs, metrics)
+  call display_wavmetrics(metrics)
+
+end subroutine
+!-----------------------------------------------------------------------
 end program
diff --git a/Modules/wavmetrics.f90 b/Modules/wavmetrics.f90
index a81359a..5ca988e 100644
--- a/Modules/wavmetrics.f90
+++ b/Modules/wavmetrics.f90
@@ -48,7 +48,7 @@ subroutine compute_wavmetric(samples, size, metrics)
 
     if (idx .GT. 1) then
       if (diff_sign(samples(idx-1)%left,  Lval))  Lfreq = Lfreq + 1
-      if (diff_sign(samples(idx-1)%right, Lval))  Rfreq = Rfreq + 1
+      if (diff_sign(samples(idx-1)%right, Rval))  Rfreq = Rfreq + 1
     endif
 
     Lsum = Lsum + Lval
@@ -56,7 +56,7 @@ subroutine compute_wavmetric(samples, size, metrics)
 
   enddo
 
-  metrics%num   = size
+  metrics%nbre  = size
   metrics%maxl  = Lmax   ;  metrics%maxr = Rmax
   metrics%freql = 1.0 / (Lfreq / real(size))
   metrics%freqr = 1.0 / (Rfreq / real(size))
@@ -72,7 +72,7 @@ subroutine display_wavmetrics(metrics)
 
   ! print '(1X, "metrics are :")'
 
-  print '(1X, "    | num          ", I0)',     metrics%num
+  print '(1X, "    | nbre         ", I0)',     metrics%nbre
   print '(1X, "    | freq         ", 2F12.2)', metrics%freql, metrics%freqr
   print '(1X, "    | mean         ", 2F12.2)', metrics%meanl, metrics%meanr
   print '(1X, "    | maxi         ", 2I8)',    metrics%maxl, metrics%maxr