There are many different names for mixing desks. These names include "sound board", "mixing console", audio production console", "mixer" and "audio mixer".

Yamah

There is not a stand alone iPhone mixing app. However, Presonus Audio Electronics has a QMix app that allows you to control monitor mixes of your Presonus Studiolive mixer.

Mixing consoles can often be purchased from general-purpose online outlets such as Amazon. More serious musicians can find them at specialized electronics stores such as Sweetwater, Musician's Friend, or Roland.

http://www.wheatstone.com/techmanuals.html