The amp can't be controlled with the Gsystem?

The amp can't be controlled with the Gsystem?

I’d like to use the settings of an amp by connecting the gsystem with the effects loop. is it possible?
my connections:

input inst G —— overdrives pedal in series ———line 6 g30 guitar
G loop 1.2.3 ——another pedals
G pedal in ——- amp in
G output L ——-digitech trio loop——— amp send
G output R ——- amp return

In this case it’s work. but i can’t control the amp at all. no volume no eq…..

Please help!

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Source: http://forum.tcelectronic.com