Kenwood TS-990S Setting Manual page 13

Connect the PC sound functions and audio cable with reference to the following
diagram.
Reference:
If the TS-990S is connected to the PC using a USB cable, audio transmission
input and output are possible using the USB audio function, but the many signal
conversions cause inherently unavoidable delays. Furthermore, during KNS
operations, network delays will occur. To minimize delays as much as possible,
connections using an audio cable are recommended.
Delays also depend on the PC load and network traffic.
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