The Genos manual (page 46) provides the following examples for single finger chords:
C = Root key only
Cm = Root key + black key to the left
C7 = Root key + white key to the left
Cm7= Root key + white key to the left + black key to the left
Therefore to play Eb, i think you would play
Eb = Root key only (E flat or D sharp alone)
Ebm = Root key + black key to the left (E flat + D flat)
Ebm7 = Root key + white key to the left + black key to the left ((E flat + D+ D flat)
i do not play single chords, so i am not entirely sure but i think that's it.
Hope this helps.
thanks