Hi,

I'm setting up a multi-channel Buffalo III with 2 stereo I2S input channels and 2 stereo outputs. Buffalo is running the new firmware and the I2S source is a MiniSHARC.

Input configuration
* Channel 1 is connected to input D2 on the Buffalo
* Channel 2 is connected to input D4 on the Buffalo
* D2 and D3 are linked using the jumper JPCM2 on the Buffalo
* D4 and D5 are linked using the jumper JPCM1 on the Buffalo
* JPCM3 is not fitted.

Output configuration
* J7, J8 and J9, J10 are linked using jumpers to create 2 output channels (left)
* J1, J2 and J3, J4 are using jumpers to create 2 output channels (right)

Buffalo configuration
* All DIP switches are in default "on" position except for 2:5, which disables S/PDIF autodetect.

Expected behavior
* With only 1 I2S input connected at D2 on the Buffalo, I'd expect to see a signal at Buffalo outputs 1,2,3,4.
* With 2 I2S inputs connected at D2 and D4, respectively, I'd expect to see D2's signal at Buffalo outputs 1,2,3,4 and D4's signal at Buffalo outputs 5,6,7,8.

Actual behavior
* With only 1 I2S input connected at D2 on the Buffalo I see its signal output at all 8 Buffalo channels.

The question I have is: why??? It's as if the input signal is bridged across D2, D3, D4, D5, but I've double checked that jumper JPCM3 is NOT fitted (only JPCM1 and JPCM2), so I don't understand why I see the signal at all the Buffalo's outputs.

Can anyone help diagnose, debug, or answer the question?

Thanks!
Sparky