[Elecraft] Impossible mission? USB with the 13khz filter for PSK31 on Digipan

[Thomas Tumino]

Hi there,
 
I am running my K3 with Digipan computer software on PSK 31.  I also have a full complement of 5 filters in the K3, with the widest being the KFL3B-FM 13Khz filter.
 
Because Digipan can receive many PSK signals at once (Multichannel Window), I would like to set my K3 to receive USB through the 13Khz filter.  
 
Unfortunately, despite specifically enabling the KFL3B-FM 13Khz filter in USB mode, I cannot get 13Khz of bandwidth in USB receive.  As a matter of fact, I cannot seem to get much more then 4Khz of receive in USB receive mode.  I can get the XFIL display to tell me I am receiving through the 13Khz filter, but only about 4Khz of audio will pass through (perhaps the DSP??).
 
Am I missing something here, or is this just an oversight in firmware design?  Multichannel simultaneous receive of a massive chunk of bandwidth is a great feature of Digipan that I would love to take advantage of with my K3.  
 
Does someone know how to receive USB at a 13Khz bandwidth with the K3?
 
73,
Tom-N2YTF
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