dj_eq downmixing sterero channels?

[MWWorks]

Many thanks for writing these plugins :) I'm using them via ALSA for an equaliser for an audio project. This works perfectly in my asound.conf (mpdmix is a dmix but I get the same results with the relevant hw):

ctl.mbeq {
    type equal
    library "/usr/lib/ladspa/mbeq_1197.so"
    module "mbeq"
    controls ".mbeq.bin"
}
pcm.mbeq {
    type equal
    slave.pcm "plug:mpdmix"
    library "/usr/lib/ladspa/mbeq_1197.so"
    module "mbeq"
    controls ".mbeq.bin"
}

However, I actually want to use just 3 bands and dj_eq seems perfect. But when I try it:

ctl.dj_eq {
    type equal
    library "/usr/lib/ladspa/dj_eq_1901.so"
    module "dj_eq"
    controls ".dj_eq.bin"
}
pcm.dj_eq {
    type equal
    slave.pcm "plug:mpdmix"
    library "/usr/lib/ladspa/dj_eq_1901.so"
    module "dj_eq"
    controls ".dj_eq.bin"
}

The resulting output is L+R input downmixed and playing back on both L/R channels. The fact that there is also dj_eq_mono suggests that dj_eq is/should be stereo?

Before I bash my head against the brick wall of my limited understanding of ALSA/LADSPA, I just wanted to check if this should work? Should dj_eq be able to accept and output separate L/R channels?