kolbe,
one way of solving your problem would be to declare a global variable that your trackbar ValueChanged sub can use to differentiate a change made within the program from a change made by user input. In this example, the code in bar_ValueChanged only executes if the change DOES NOT come from Timer1_Tick:
Sub Globals
Dim auto_change
End Sub
Sub Timer1_Tick
auto_change=true
' change bar.value here
auto_change=false
End Sub
Sub bar_ValueChanged
If auto_change=false Then
' change fmod.position here
End If
End Sub
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