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Running fldigi as root the first time is recommended until everything working before worry about correcting permissions. Use this command to enable rig control before running fldigi sudo adduser $USER dialoutto configure your IC-7600 to accept audio from the USB interface, decide whether your digital mode operation will employ DATA 1 mode (D1), DATA 2 mode (D2), DATA 3 mode (D3), or will be accomplished with DATA mode not in use. Then open the transceiver's ACC SET menu and#set the appropriate entry's signal source to USB#set the USB MOD level to 50% (you can increase or decrease this later to fine-tune the output level) In Software#specify your transceiver's CI-V address in hexadecimal#set the radio's CI-V Transceive parameter to off#select the baud rate, parity, word length, and stop bits that match your radio's settings, do not use your radio's auto baud rate setting, as doing so can result in missed or garbled CI-V commands