Harmonic mixing
The Camelot code for a key, and what mixes with it.
Type a key the way you would write it, Am, F#m, Bb, A minor, or a Camelot code like 8A. This page maps it onto the wheel and lists the keys that sit next to it. It does not guess a key. For that, drop a file and use the on-device read.
Mixes with
Next, the tempo: tap it or read it from the file. Or start a release with this key. The key line goes into the run as material, and a track read on this page goes with it.
Reading the wheel
Twelve numbers, two letters.
The number is the position on the circle of fifths. A is minor, B is major. Moving one number up or down is a fifth either way and changes one note of the scale. Switching the letter keeps the number and every note, and swaps the minor key for its relative major. Sharps and flats name the same slot: F# minor and Gb minor are both 11A.