[Elecraft] K2 on digital modes questions

[Paul Huff]

I just added the SSB board to my K2 and it seems to be working great.  (I made a 
40-meter QSO and was given a report of "nice crisp audio.")  I'm not an SSB 
operator and my real goal for adding this option is to be able to work some of 
the digital modes.  I have 3 quick questions...

1.  Is there any advantage to using the RTTY mode as opposed to the SSB mode on 
the K2?

2.  If I use the RTTY mode, do I need to change the filter settings?  Currently 
they show 2.2, 2.0, 1.8, and 1.6 as default values without any setup from me. 
(I setup my SSB filters to OP1, OP1, 1.8, and 0.7 with the thought that the 0.7 
might be useful in some digital situations.)

3.  I configured my K2 microphone connector for an Icom HM-12 microphone (the 
only one that I own) which requires a small bias voltage on AF through a 10k 
resistor.  Is this bias voltage likely to cause me any trouble when I hook up my 
interface (a "Rascal" from K4ABT)?  ...  Actually, I think that I have already 
answered this question by looking at the schematic for the Rascal interface. 
The AF connects through a capacitor to an audio level pot across an isolation 
transformer.  That capacitor should block the DC bias so I don't think that I 
will need to reconfigure the microphone connector in the K2.  Does this make 
sense?

Thank you ahead of time for any and all comments to any of my questions!

73,
Paul - N8XMS