What connectors do I need, and where do you recommend we get them, to use an iPhone7 that only has the lightening connector?
Does Virtual Midi use the phone's mic to pick up the guitar pitches or does the guitar output get sent through the connector to the iPhone?
You will need the iDevice adapter that we sell at ToneWoodAmp.com and the adapter to connect the 3.5mm jack to your lightning port.
VM does use the on-board mic of your iPhone to listen to the TWA effects and the iDevice cable receives the signal from your iPhone.
The way I've always connected it is by having the iDevice adapter plugged into the TWA. You could use a TRRS cable to your lightning adapter.
I typically prop up my iPad about 2-3 feet in front of me... I feel it picks up the sound great there and I can easily reach it to adjust or change effects. I haven't really tried any other positions- it worked there the first time, so I just kept doing it.