Hi ingo

> quality is very high, but more than 500 $ is quite expensive.

and by the way: I saw, that the cwejman EQ does not continuously add or
subtract the corresponding band asyou would expect it from a mixing
console's EQ. You have to switch between add or subtract. So it is
assumingly nothing else than a A127 plus inverters for the original mix
(incl. the switches 5 Euro of material).

It should be a very simple addon package (one TL064, eight resistors,
three switches) which would modify the A127.

Florian