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Sorry, RapidEars is only supported at 16kHz input. The 8k option in OpenEars isn’t supported for RapidEars or stock PocketsphinxController; it’s made available for the cases in which you want to only do speech detection (without recognition) and then do something different than offline recognition with the speech after it is detected and would prefer to take in 8k speech. But offline recognition needs to be done at an input rate of 16k.
You can give it a try with changing the sample rate or letting the other library override it and see what the results are — sometimes with a small and unique vocabulary the results can be acceptable for recognition, but it isn’t possible to give support for unexpected results or technical or implementation issues that could arise as a result.