AFAIK there does not exist a 2.1 format. There is 2.0 or 5.1 however.
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PP doesn't offer the option of 2.1 audio. You'll have to use a standard 5.1 sequence, and just leave the center and surround channels empty.
Note that such a config may not allow receivers to go into ProLogic or other matrix modes, which means the channels will be kept as Left and Right, even if the viewer has a 5.1 setup. That is kind of weird.
There is not officially a 2.1 surround but there is a 2.1 surround..now thats confused you..heres why
5.1 is a setup consisting of the following.
1x left front spkr
1x right front spkr
1x center front spkr
1x rear left spkr
1x rear right spkr
and finally 1x dedicated sub spkr.
All the above are encoded in the mix.
If you want 2.1 sound then there are no presets, all you can do is have a stereo channel and set your playback amplifier to use the sub woofer, and the crossover within the system will give you a left/ right and sub channel.so 2.1. But its really just stereo .