In 2.1 mode with subwoofer, BQ1 block settings seem to change behavior of BQ4a block. For example, if BQ4a is set to Butterworth 2 LPF at 400 Hz, then applied, it seems to work normally. However, if the BQ1 block is set to Butterworth 2 HPF at 400 Hz and applied, it seems to be applied to BQ4a block, however it does not show in the setting window. The BQ4a block will not operate correctly unless the BQ1a filter is removed (set to all-pass). What is going on?