[Elecraft] AFSK on K3

[N4BP]

I'm unable to transmit an AFSK signal in DATA mode, although I can transmit
RTTY in LSB mode.  The line output from my computer soundcard does have the
audio signal on it and is connected to the Line In mono jack on the K3.  For
MIC SEL in configuration, I have Line In selected.  DATA MD is set to AFSK A
and shows 45 bps.  PITCH is set to 2125-170.  Using MMTTY software barefoot
which works properly with my FT-1000MP  (same cable, but new phone plug
connectors to mate with K3).  K3 goes into transmit mode and audio signal is
present on cable feeding K3's Line In, but no modulation.  What am I
missing??

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