[Elecraft] DATA A mode audio inputs

[Bill W5WVO]

This question may have been asked and answered earlier, but I can't find it. When using DATA A for audio sound card modes and selecting the rear-panel line-in and line-out jacks, is the audio from the mic (both front and rear panel) disconnected, such that the only audio coming into the transmitter is from the line jack? I have an email from TigerTronics saying they believe it is not disconnected, thus allowing random mic inputs to mix with the sound card audio coming in through the Line connection. I would like to disabuse them of this belief if possible.

Bill W5WVO