TascamiXZ Microphone and Instrument Audio Interface for iOS Mobile Devices, iPhone, iPod, and iPad

Can this be used with a Sennheiser E835 on an iPhone 5 to record videos? I really want excellent audio...

can I use this as an adapter for a mic and still record video at the same time? On an Iphone 5s or ipad

I need to record rehearsals for a band with loud drums, guitars, bass, and vocals. Will using this w/ right mic allow it to be audible?

can the Tascom iXZ be used with keyboards?