Speaking with Obisek and using the new Romulan dialogue options gives Obisek responses that play at a much lower volume than the standard voiceover. Once he finishes the new lines, it returns to the standard volume VO as he concludes the interaction.
Edit: There are similar voice variances in the subsequent mission Mine Enemy when you are speaking to Commander Janek.
Last edited by arkhaman; 05-18-2013 at 12:23 AM.
Reason: Additional info