How to make Audio VCD compliant?

[Bubba]

I'm not sure this post should be here or in the Audio forum, but the question I'm about to ask is related to VCD, and so I decide to post it here.

I download some MPEG clips, and I noticed that the Video part of these clips look VCD-compliant (i.e. 352x240 or 352x288), but the audio part are not. Some have lower frequency than 44100 Hz, some have different bit rates that the required 224 Kbits/sec for VCD, and some have only 1 channel instead of 2. I was thinking ...

1. Demux the video & audio part using TMPGEnc. This will produce a MPV file & a MP2 audio file.
2. Convert the MP2 to Wav
2a. Create another channel of Wav (L & R)
--Note: Do I need this step 2a? (I'm not sure that VCD-compliant need 2 audio channels or not)
3. Up-sampling the Wav to 44100 Hz
4. Re-encode the upsampling file from step 3 to VCD-compliant MP2 file at 224 KBits (using tooLame).
5. Mux the step 4's MP2 file back to the MPV file from 1.

These steps should get me a VCD-compliant MPEG clip. Anyhow, I know how to do step 1, 4, and 5, but I do need help or guidance to do step 2, 2a and 3.

Thank you in advance & merry X-Mas!