How to configure HTS demo with STRAIGHT features for 16kHz training data

I have been using HTS for a while for my research on speech synthesis. Recently, I have had some problems when I tried to configure the HTS demo with STRAIGHT features to use 16k data instead of 48k. I finally figured out how to properly do that work, and it is really not as easy as changing one or two configurations like in other demoes without STRAIGHT, so I decided to note all the steps down here.

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