I use a arranger keyboard(Roland ea7). I want to arrange that, when i play the chords (with my left hand) on the arranger, i want to control the key of the vst plugin that is playing a pad. (meaning,h when i play E minor on the arranger,the Plugin plays E minor). Can i do this? how? Thanks so much.
Do you play for example the notes e g b on your keyboard?
And when you play with the left hand what do you see in the global midi monitor of Gig Performer?
That’s right a screenshot of the MIDI monitor would help 
First of all,i didn’t buy GP yet,thats why i’m asking this question,so i will know if it pays to buy. The plugin is playing a pad via a midi pad controller,(the pad plays continuously,like a loop),and i’m playing a style/rhythm on the arranger keyboard,and controlling the chords (from the style) with the left hand.(if you don’t know how the arranger works,check it out,it’s Roland ea7,it has midi in & out ports) . Can i control the pad, via the left hand on the arranger,so when the style plays (for example) a E chord,the pad plays E? The arranger would be the host,and the plugin would be the slave. The arranger will trigger which notes the plugin should play. How do i set it up? Do i need a special script? The idea is,like a lot of arrager keyboards,that comes with (let’s say) 5 buttons that plays a pad,the notes of the pad (meaning C,D,E,F ect.) would be controlled via the left side keys (called lower keys), i want the same thing to happen with the pads playing from the midi pad controller. Thanks so much,was trying to make it clear to understand.
Let me try to understand:
With your arranger you play the e minor by pressing just e with your left hand?
And now you want in Gig Performer play an e minor chord?
What does the global midi window show when the arranger is playing?
https://gigperformer.com/docs/Userguide36/editwindow.html
Does your arranger keyboard send out the entire chord as MIDI messages when you press a single key with your left hand? If so then yes, otherwise no!
On the other hand, there are plugins around (Scaler, InstaChord, Cthulhu, among others) that can do precisely this kind of thing so you can use one of those instead.
Let me try to understand:
With your arranger you play the e minor by pressing just e with your left hand? no,i also have to press A flat ,which is g sharp.
And now you want in Gig Performer play an e minor chord? yes.
What does the global midi window show when the arranger is playing? i don’t have yet GP.
https://gigperformer.com/docs/Userguide36/editwindow.html
Thanks so much.
I think, even in GP you rather need to play a G to play an E minor. (E=E-G#-B, Em=E-G-B). 
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I skimmed through the EA7 manual. When you split your arranger keyboard, the “Lower” part will transmit MIDI on a separate channel (assignable). If the plug-in is on the same channel, it will play whatever the chord/Lower part plays. Is this what you are talking about?
Yes,this is what i was looking for so long. WOW, i’m so amazed of your kindness. I my self don’t understand MIDI language,so even if i have read the book,i woudn’t have get to this answer! Such amazing support! GOD bless you.