> Does anybody know if I can use the Midi Out on my guitar effects board
> to interface with the A-190
>
> I am assuming there would be no problems, but I just want to be sure.
>
> Thank you in advance.

To use the A-190 you need a Midi transmitter that generates Midi note on/off
messages. I don't think that your guitar effects board is able to generate
these messages.

Best wishes
Dieter Doepfer