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SX1301 GPIO output configuration

Following the instructions on https://github.com/Lora-net/lora_gateway/wiki/SX1301-GPIO-output-configuration I was able to configure my gateway to output the RX status(es) through its LEDs.

What would be the implications on leaving it like that? The above mentioned post argues that changing the default configuration would not make it complaint to the SX1301AP2, with FPGA, reference design where it seems to enable the TX digital filter. What does that mean in a practical sense?

What are the options available for the GPIO_SELECT_OUTPUT register, and their implications?