QUOTE(andante_in_c @ Jul 6 2008, 07:47 AM)

It works in a similar way to a passing note, but comes between two notes of the same pitch. A lower auxiliary is, as the name suggests, a second lower than the two notes either side of it. So, for example, in the group D-C-D, the C is the lower auxiliary. The outside notes of the group will be consonant with the harmony below, the lower auxiliary dissonant.
Thank you very Much