The song I am currently working on is in a flat key, how do I set my Helicon product to a flat key?
When working in a song in the key of Bb (flat) for example, you can also select A#(sharp) These 2 keys use exactly the same notes and will give you the same final outcome. This is know as an 'enharmonic equivalent'. You can read more about this here: http://en.wikipedia.org/wiki/Enharmonic
Please refer to this chart to get a better understanding of how sharp and flat relate to each other.