first, make sure you open the whole show. 60mins or whatever,
open the whole thing at once.
then here's what to do...
1. Select the right channel by double-clicking in the place shown in the picture.
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2. Copy.
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3. Create a new file. Make sure you get the settings exactly right as in the picture. select ok.
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4. Paste.
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5. It will convert the file to stereo!
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6. Save a backup.
DC OFFSET Correction
Now another important thing I noticed looking at your screenshot is that the dc offset is incorrect. You can check the dc offset by going to analyze > statistics.
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If it is not zero (or very very close), it is good to fix it. When the dc offset is incorrect, the wave is not symetrical. Try analyzing the statistics on some of your favorite officially released cds, you will see that the dc offset is zero! The sound will be a tiny bit better this way because your speakers can work better with a centred wave.
Also, it is best to take as few steps as possible when processing audio in any way. So, if you want to raise the volume and correct the dc offset at the same time, this is the shortest method:
1. Select all.
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2. Go to Effects > Amplitude > Normalize.
Be sure to normalize an entire show all at the same time, not each track one at a time! This is very important.
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4. Set it to 98% and enable dc bias adjust.
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this will boost the volume of the show to a safe level and at the same time. If you don't want to adjust the volume of the show, uncheck the box for "Normalize to"
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alternatively, you can also correct the dc offset using Amplify. Either use the Normalization option or the Amplify option, but never both! Just one or the other. So to correct the dc offset using "Amplify", go to Effects > Amplitude > Amplify. In this case we are not going to amplify at all, just correct the dc offset. There is a preset for this on the right, called "center wave". Select it and press ok.
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5. Go to Analyze > Statistics again and verify that the dc offset is now zero (or very very close like 0.002 or something).
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6. Save this.
Then you just have to cut the show on the sector boundaries. If you're not sure about how to do this, let me know I can show you how to do this correctly as well.
Work slowly and carefully, saving backups frequently.