How to use DEC = SOVADEC( MSG, LLR, TRELLIS, WIN )

http://www.mathworks.nl/matlabcentral/fileexchange/3801-soft-input-soft-output-viterbi-algorithm

From the above link, I found SOVADEC. I have the following questions on how to use it:

DEC = SOVADEC( MSG, LLR, TRELLIS, WIN ) (1)

1: The input MSG in (1) is the soft coded bits (e.g., 3bits) generated from first using Matlab Convenc, adding noise and then quantize to 8levels, right?

2: The LLR in (1) should be for each coded bit, so it should a vector with the same length of MSG, right?

3: Trellis should be the results from using Matlab poly2trellis command, right?

Your comments, guidance and help are greatly appreciated.

Thank you.