Many thanks for your reply, I really appreciated. :)
Unfortunatly I've read several times documentation, without succes;
My configuration is the following:
Spider Jam Amp -> FBV footboard MK2 -> External Pedal EX-1
However, I have just tried with an other Amp, It's working very well with the following:
Spider IV 75 Amp -> FBV footboard MK2 -> External Pedal EX-1
Also: My Spider Jam Amp contains well the latest Firmare 2.09.
Also My Spider should support an external pedale thru FBV MK2 ( In the Spider doc we can see the following).
"External Pedal Jack: You can connect an expression pedal (such as the Line 6 EX-1) to the Shortboard’s
rear panel 1/4-inch jack, and the connected pedal will control Volume, while the Shortboard pedal controls Wah only."
I don't know how can I do
:mellow: