(Starting with "z", the keys on the keyboard can be used to play notes.)
Microtone  by AnoHito
Base Pitch?The pitch of the first note. Must be between 32 and 16384. 
Scale Length?The number of notes in the scale. Must be between 1 and 128. 
Keys?The number of keys to display on the virtual keyboard. Must be between 1 and 128.