diff --git a/fpvt.frm b/fpvt.frm
index d26be83..a51e574 100644
--- a/fpvt.frm
+++ b/fpvt.frm
@@ -231,11 +231,11 @@ End Sub
 '--------------------------------monthly buttons--------------------------------------
 
 Private Sub opmPrice_Click()
-    'calc_mval
+    calc_mval
 End Sub
 
 Private Sub opmVol_Click()
-    'calc_mval
+    calc_mval
 End Sub
 
 Private Sub tbmfPrice_Change()
@@ -248,6 +248,12 @@ End Sub
 
 
 
+Private Sub tbMFVal_Change()
+    If mline = 0 Then Exit Sub
+    If clear_lb Or load_tb Then Exit Sub
+    If opEditSalesM Then calc_mval
+End Sub
+
 Private Sub tbmfVol_Change()
     If mline = 0 Then Exit Sub
     If clear_lb Or load_tb Then Exit Sub
@@ -560,31 +566,33 @@ Sub calc_mval()
     Dim pchange As Double
     
     If IsNumeric(tbMFVal.value) Then
+        fValm = tbMFVal.value
         'calculate percent change
-        If (CDbl(tbmPAVal.value) + CDbl(tbMBaseVal.value)) = 0 Then Exit Sub
-        pchange = CDbl(tbMFVal.value) / (CDbl(tbmPAVal.value) + CDbl(tbMBaseVal.value))
+        'If (pValm + bValm) = 0 Then Exit Sub
+        pchange = fValm / (pValm + bValm)
         
         'plug the adjustment required
-        tbMAVal = Format(CDbl(tbMFVal.value) - CDbl(tbMBaseVal.value) - CDbl(tbmPAVal.value), "#,###")
+        aValm = fValm - bValm - pValm
         
         
         '---------if volume adjustment method is selected, scale the volume up----------------------------------
         If opmvol Then
-            tbMFVol = Format((CDbl(tbMPAVol.value) + CDbl(tbMBaseVol.value)) * pchange, "#,###")
+            fVolm = (pVolm + bVolm) * pchange
         Else
-            tbMFVol = Format((CDbl(tbMPAVol.value) + CDbl(tbMBaseVol.value)), "#,###")
+            fVolm = pVolm + bVolm
         End If
-        tbMFPrice = Format(CDbl(tbMFVal.value) / CDbl(tbMFVol.value), "#.000")
-        tbMAVol = Format(tbMFVol - (CDbl(tbMBaseVol) + CDbl(tbMPAVol)), "#,###")
-        tbMAPrice = Format(CDbl(tbMFVal.value) / CDbl(tbMFVol.value) - ((CDbl(tbMBaseVal.value) + CDbl(tbmPAVal.value)) / (CDbl(tbMBaseVol.value) + CDbl(tbMPAVol.value))), "#.000")
+        fPrcm = fValm / fVolm
+        aVolm = fVolm - (bVolm + pVolm)
+        aPrcm = fValm / fVolm - (bValm + pValm) / (bVolm + pVolm)
     Else
-        'tbMFVal = Format(CDbl(tbMPAVal.value) + CDbl(tbMBaseVal.value), "#,###")
-        tbMAVol = Format((CDbl(tbMFVol.value) - CDbl(tbMBaseVol.value) - CDbl(tbMPAVol.value)), "#,###")
-        tbMAPrice = 0
-        'tbMAPrice = Format(CDbl(tbMFVal.value) / CDbl(tbMFVol.value) - ((tbMBaseVal + tbMPAVal) / (tbMBaseVol + tbMPAVol)), "#.000")
+        aVolm = fVolm - bVolm - pVolm
+        aPrcm = 0
     End If
     tbMFVal = Format(tbMFVal, "#,###")
     
+    Me.load_mbox
+    Me.load_array
+    
 End Sub
 
 Sub calc_mprice()
diff --git a/fpvt.frx b/fpvt.frx
index a9afb12..2d3090b 100644
Binary files a/fpvt.frx and b/fpvt.frx differ