diff --git a/SoundBrotching/.gitignore b/SoundBrotching/.gitignore
index 4cc5eb5..70d02e9 100644
--- a/SoundBrotching/.gitignore
+++ b/SoundBrotching/.gitignore
@@ -9,6 +9,7 @@
 text2wav
 wav2text
 text2ao
+essai
 
 panoramix
 genwaves
diff --git a/SoundBrotching/Makefile b/SoundBrotching/Makefile
index ec1e544..feee204 100644
--- a/SoundBrotching/Makefile
+++ b/SoundBrotching/Makefile
@@ -4,7 +4,7 @@
 
 GOPT = -Wall -Wextra -time -g 
 
-all:	panoramix genwaves 
+all:	panoramix genwaves essai
 
 # ----------------------------------------------------------
 #
@@ -16,6 +16,10 @@ FLIBS = soundbrotch.o
 soundbrotch.o:	soundbrotch.f90 Makefile
 	gfortran $(GOPT) -c $< 
 
+# some test...
+essai:		essai.f90  Makefile $(FLIBS)
+	gfortran $(GOPT) $< $(FLIBS) -o $@
+
 # main proggies
 panoramix:	panoramix.f90 Makefile $(FLIBS)
 	gfortran $(GOPT) $< $(FLIBS) -o $@
diff --git a/SoundBrotching/demos.sh b/SoundBrotching/demos.sh
index c611180..0b12e0d 100755
--- a/SoundBrotching/demos.sh
+++ b/SoundBrotching/demos.sh
@@ -8,7 +8,7 @@ DATAFILE="waves.text"
 
 OUTWAV="quux.wav"
 
-./genwaves | ./panoramix | tee $DATAFILE | c-tools/text2wav $OUTWAV
+./genwaves | tee $DATAFILE | c-tools/text2wav $OUTWAV
 
 sndfile-spectrogram				\
 	--min-freq=30 --max-freq=4000		\
diff --git a/SoundBrotching/essai.f90 b/SoundBrotching/essai.f90
new file mode 100644
index 0000000..8e135f3
--- /dev/null
+++ b/SoundBrotching/essai.f90
@@ -0,0 +1,21 @@
+program essai
+
+  use soundbrotch
+  ! -----------------------------
+  implicit none
+
+  integer          :: n
+  real             :: freq
+
+  write(0, *) "*** On essaye des trucs (shotgun!) ***"
+
+  call soundbrotch_version()
+
+  do n = 20, 85
+    freq = midi2freq(n)
+    write(0, '(12X, I5, 5X, F9.3)') n, freq
+    call sinw_burst2i(6, 22000, freq, freq, 0.9)
+    call silence_burst2i(800)
+  end do
+
+end program
diff --git a/SoundBrotching/genwaves.f90 b/SoundBrotching/genwaves.f90
index 40be546..dfde686 100644
--- a/SoundBrotching/genwaves.f90
+++ b/SoundBrotching/genwaves.f90
@@ -11,12 +11,13 @@ program genwaves
   write(0, *) "*** Genwaves ***"
   call soundbrotch_version()
 
-  do clock = 1, 8
+  do clock = 1, 11
     fleft  = real(100 * clock)
-    fright = real(150 * clock)
+    fright = real(116 * clock)
     write(0, '(1X,I8, 9X, F8.2, 6X, F8.2)') clock, fleft, fright
-    call sinw_burst2i(6, 4800, fleft, fright, 0.7)
- enddo
+    call sinw_burst2i(6, 23200, fleft, fright, 0.7)
+  enddo
+  call silence_burst2i(1337)
 
 end program
 
diff --git a/SoundBrotching/panoramix.f90 b/SoundBrotching/panoramix.f90
index baab225..635066c 100644
--- a/SoundBrotching/panoramix.f90
+++ b/SoundBrotching/panoramix.f90
@@ -21,11 +21,11 @@ program panoramix
     endif
 
     !  *** NON WORKING CODE ***
-    phi   = real(nblus) / 60000.0
+    phi   = real(nblus) / 44100.0
     ka    = sin(phi)
     value = (real(left)+real(right)) / 2.05
-    left  = int(value*ka)
-    right = int(value*(1.0-ka))
+    left  = int(value * ka)
+    right = int(value * (1.0-ka))
 
     print *, left, right
 
diff --git a/SoundBrotching/soundbrotch.f90 b/SoundBrotching/soundbrotch.f90
index 48bf994..1b50f36 100644
--- a/SoundBrotching/soundbrotch.f90
+++ b/SoundBrotching/soundbrotch.f90
@@ -7,12 +7,19 @@ module soundbrotch
     integer             :: right
   end type
   ! ---------------------------------------------------------
+  !      some private variables
+  
+  integer, private               :: samplerate    = 48000
+  real, private                  :: diapason      = 440.0
   contains
   ! ---------------------------------------------------------
-
   subroutine soundbrotch_version ()
     write(0, '(1X,A)') "--- this is soundbrotch version alpha 666"
+    write(0, *) "--- samplerate", samplerate
+    write(0, *) "--- diapason  ", diapason
   end subroutine
+  ! ---------------------------------------------------------
+  ! ---------------------------------------------------------
 
   ! ---------------------------------------------------------
   !        premier essai, le prototype peut changer !
@@ -25,31 +32,55 @@ module soundbrotch
 
     integer                    :: idx, left, right
     real                       :: coef
-    integer, save              :: oldl=0, oldr=0
 
-    coef = (3.141592654 * 2.0) / 44.1e3
+    if (dst .NE. 6) then
+      STOP '   OUPS!'
+    endif
+
+    coef = (3.141592654 * 2.0) / real(samplerate)
     do idx=0, numbs
       left  = INT(32e3 * level * sin(coef*real(idx)*fra))
-      left  = (left  + oldl) / 2
       right = INT(32e3 * level * sin(coef*real(idx)*frb))
-      right = (right + oldr) / 2
-      print *, left, right
-      oldl  = left
-      oldr  = right
-    enddo
-    ! add silence at the end of the burst
-    left  = 0
-    right = 0
-    do idx=0, numbs/3
-      left  = (left  + oldl) / 2
-      right = (right + oldr) / 2
-      print *, 0, 0
-      oldl  = left
-      oldr  = right
+      call xper_spit_2i(left, right)
     enddo
 
   end subroutine
   ! ---------------------------------------------------------
+  !        mmmm ?
+  subroutine silence_burst2i(nbsmpl)
+    integer, intent(in)     :: nbsmpl
+    integer                 :: idx
+    do idx=0, nbsmpl
+      call xper_spit_2i(0, 0)
+    enddo
+  end subroutine
+  ! ---------------------------------------------------------
+  !        mmmm ?
+  subroutine xper_spit_2i(lsmpl, rsmpl)
+    integer, intent(in)     :: lsmpl, rsmpl
+    integer, save           :: oldl, oldr
+    integer                 :: tmpl, tmpr
 
+    tmpl = (lsmpl + oldl) / 2
+    tmpr = (rsmpl + oldr) / 2
+    print *, tmpl, tmpr
+    oldl = tmpl
+    oldr = tmpr
+
+  end subroutine
+  ! ---------------------------------------------------------
+  ! 
+  function midi2freq(note)
+    integer, intent(in)    :: note
+    real                   :: midi2freq
+
+    real                   :: freq
+
+    freq = (DIAPASON/32.0) * (2.0 ** (real(note - 9) / 12.0));
+    ! write(0, *) "> ", note, freq
+
+    midi2freq = freq
+
+  end function
 end module