marshall_mg15cd JS: Direct tweaking of knobs & buttons in GUI needed

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AudioBlank marshall_mg15cd provides a GUI with knobs and buttons similar to
those found in the actual amplifier.

But direct manipulation of knobs/buttons has not been implemented yet.

Workaround: 
Reaper (or any other plugin host) provides faders above the actual GUI. By
tweaking the faders one can control these knobs.

Original issue reported on code.google.com by ananth.p...@gmail.com on 4 Jun 2008 at 9:37