OnKeyUp error sound

[KodeZwerg]

That event is just too late for it.
"Prevent" you can only in OnKeyDown or OnKeyPress (KeyPreview must be True)

Wrong.

Thaddy, please show me my mistake, I really want to learn from you. Current solution is with exact what I wrote, so I am unhappy 

Ctrl doesn't raise sounds, but Ctrl + letters does. Ctrl is Strg on German keyboards.

Must be a local phenoma, here I can hit CTRL with whatever = nothing happen, no sound no nothing and as long as I can remember it never did.
I just created a fresh empty LCL app and hit like a monkey on keys.... no success to make some noise beside my keyboard is doing *click click click* 

[dseligo]

Must be a local phenoma, here I can hit CTRL with whatever = nothing happen, no sound no nothing and as long as I can remember it never did.

Did you try with test project I posted? It depends on what control you have focus. I got sound when in TEdit, TMemo (not all combinations), TComboBox, TMaskEdit, TDBEdit, TDBLookupComboBox, e.g.
I don't get sound when I have focus on TButton, TBitBtn, TRadioGroup, TDateTimePicker, ...

I guess it depends on Windows widgetset.

[KodeZwerg]

@dseligo
Ahh now I do understand and confirm you, sorry my bad!!
Yes, on whatever kind of edit you will hear a sound when pressing CTRL + Letter.

@Thaddy, where are you?