MIDI Guitar 2 to Tonewood Amp

When i plug my tone wood amp into my IOS device it not only midi’s the sound coming from my guitar but it also is picking up stage noise from my IOS device microphone. I bought the appropriate hook up straight from Tonewood Amp for IOS devices but i cannot deactivate the microphone as that’s what MIDI guitar uses to work in the first place! Just spent $60 on all these apps and can’t get it not to feedback due to my microphone picking up every noise around.