TASCAM US-4x4 Audio Capture DirectShow Filter

[AlvaroBT]

Hi,
Is possible to take the 4 inputs througth a DirectShow filter? How?
There are 3 DirectShow AudioRederes:

• Microphone (Mixing Driver 1 for US-2x2 US-4x4)
• Microphone (Mixing Driver 2 for US-2x2 US-4x4)
  
• Microphone (2- US-4x4)

When I select the first one I can ear the input 1 and 2 (the 1 by left and the 2 by rigth) but is impossible for me ear the channels 3 and 4, why?
Thanks a lot!