#144 Low-pass filter applies to more than just the channel selected

[Aaron Altman]

I have an Asus Xonar DS and am intending to use it as an active crossover. Here's a minimal example demonstrating the problem I'm running into:

Channel: L
Filter: ON LPQ Fc 1400 Hz Q 0.7071
Channel: RL
Filter: ON HPQ Fc 1400 Hz Q 0.7071

Using this configuration, I hear full range coming out of R and RR - as expected. On the left, I only hear sound coming out of L, not RL. This appears to be due to the LPQ applying to both L and RL. How can I get the LPQ to apply only to L, as I thought this config file would have been intended to specify?

I tried using pre-mix and post-mix and got the same results:

Stage: pre-mix
Copy: L=L+RL R=R+RR
Copy: RL=L RR=R
Copy: LFE=L+R

Stage: post-mix
Channel: L
Filter: ON LPQ Fc 1400 Hz Q 0.7071
Channel: RL
Filter: ON HPQ Fc 1400 Hz Q 0.7071

I did not find a log file under C:\Windows\ServiceProfiles\LocalService\AppData\Local\Temp\EqualizerAPO.log - the surrounding folder does not exist. I'm on Windows 10.

The device is configured for 8 channels, 7.1 analog out in the Xonar DS Audio Center, and has exclusive access disabled from the Sound control panel.

What else can I try?