After hours of searching I discovered WaveToLip is included in BI Editing Tools 2.5.1, and proceeded to make a .lip file by dragging a wav I made onto WaveToLip. Following the directions on this page, I successfully made a character speak by placing the following in the initialization field:

this say "Breephng"; this setRandomLip true;

... however, although sound is emitted, the mouth does not move. Note that I even tried using one of the new commands from here, setRandomLip, which also did nothing. Here is what is in the description.ext:

     class Breephng
     {
		// how the sound is referred to in the editor (e.g. trigger effects)
          name = "Breephng";
		  // filename, volume, pitch
          sound[] = {\sound\Breephng.ogg, db+10, 1.0};
          titles[] = 
          {
               0, $STRM_Breephng
          };
     };
     class cna
     {
          name = "cna";
          sound[] = {\sound\CodenameAllen.ogg, db+10, 1.0};
          titles[] = 
          {
               0, $STRM_cna
          };
     };
};

The .lip file is named the same as the audio file (I tried with both ogg and wav files).

I opened the .lip file in Notepad++ to see what it looked like, and the result:

frame = 0.040
0.000, 0
0.160, 1
0.200, 2
0.240, 0
0.280, 1
0.320, 4
0.360, 3
0.400, 0
0.520, 1
0.560, 3... 

etc. etc. for 171 lines.