WTV-SR can overwrite the original recording.
One-time programming means that after the written program is compiled into a HEX or BIN file, the process of writing this program into the microcontroller chip is called programming. The earliest microcontrollers can only be written once. Enter, so it is called one-time programming. Later, there were EEPROM and FLASH ROM, but they were all used to call them, which can specifically refer to the PC writing programs to the MCU.
Single-chip microcomputer can control recording and playback. I have information in this regard and have successfully made a product (part of the functions of a product). Due to issues such as property rights and patents, I cannot give you.