[Elecraft] K3 line out - Stereo vs Mono

[Paul M Dunphy]

     Does anyone know if the warning mentioned here in relation an 
external speaker and a mono speaker applies to the K3's line out (which 
is also stereo):

http://www.elecraft.com/manual/E740107E%20K3%20Owner%27s%20man%20errata%20D10-1.pdf

     The reason I ask is I have an old Buxcom Rascal circa 2007-2008 
that I used for RTTY and PSK on my ICOM PRO3 with great success . . . 
was thinking of just getting the K3 cable (Part 5DK3) and using it with 
MMTTY as I had been doing.

     The concern is the 1/8" plugs on the 5DK3 look to be mono for both 
audio in and audio out on it's schematic diagram.

http://www.packetradio.com/catalog/index.php?main_page=product_info&products_id=2514

     It's hard to see because the diagram is so small, but I am 99% sure 
they are 1/8" mono plugs.

     I want to do FSK, not AFSK.  Otherwise I'd just use a couple of 
stereo 1/8" inch cables to the computer.  Seeing as the Buxcom Rascal 
and 5DK3 combo will key the RCA PTT as well as handle the TX and RX 
audio, I was going to go that route.  Just switch the old ICOM cable 
with the 5DK3.  Has anyone done this?  Seems like a simple way . .. on 
the PRO3 I used this setup for RTTY, PSK, JT65, etc.  I also read that 
you shouldn't try to key the PTT line using the DB9 serial 
communications port, and since the Rascal is already working with MMTTY 
. . .

73, Paul VE1DX