WAV interleave utility?

I tried to create a dd5.1 ac3 file from 6 mono wav files using BeSweet v1.5b17 and my ac3 file came out as 5.0 not 5.1 My list.mux file is ++++++++++++++++++++++++++++++++++++++++++++++++++++= F:\Rip1\track3_FL.wav F:\Rip1\track3_C.wav F:\Rip1\track3_FR.wav F:\Rip1\track3_Ls.wav F:\Rip1\track3_Rs.wav F:\Rip1\track3_LFE.wav +++++++++++++++++++++++++++++++++++++++++++++++++++++ My commandline for BeSweet is +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ F:\BeSweet\BeSweet.exe -core( -input F:\Rip1\list.mux -output F:\BeSweet\test.ac3 -logfilea F:\BeSweet\BeSweet.log ) -ac3enc( -b 448 ) +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ My Logfie is ++++++++++++++++++++++++++++++++++++++++++++++++ BeSweet v1.5b18 by DSPguru. -------------------------- Using AC3enc.dll v0.21 by Fabrice Bellard (). Logging start : 05/31/03 , 14:22:39. F:\BeSweet\BeSweet.exe -core( -input F:\Rip1\list.mux -output F:\BeSweet\test.ac3 -logfilea F:\BeSweet\BeSweet.log ) -ac3enc( -b 448 ) [00:00:00:000] +------- BeSweet ----- [00:00:00:000]

Im sorry, I used BeSweet v1.5b18

decode your encoded ac3 to six mono waves and compare