Walter providers only a rectangle for the meters which is displayed partially in height or width, depending on the value to be displayed. Images or image strips are not used there.
It is not possible (at least for me) to create a "digit" of constant length and changing angle from this shrinking and growing rectangle, even with transparency tricks, as a vu meter will stay constant in height.
One might think of a meter bar that is created independently of Walter and gets its feed trough the reaper API and would show all active channels.
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