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Convert Format JRSS Downmix has lost the LFE channel

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mattkhan:
AIUI JRSS downmixing uses all channels to produce the downmixed output as per Matt's post here -> https://yabb.jriver.com/interact/index.php/topic,79282.msg538644.html#msg538644

However using convert format as per mojave's guide (http://www.avsforum.com/forum/113-subwoofers-bass-transducers/1333462-new-master-list-bass-movies-frequency-charts.html#post23468771) to downmix to mono now appears to produce output that is missing the LFE channel. To debug, I created a multichannel wav file that contains a sine wave on each channel (10, 15, 20, 25, 30, 35, 40, 45) then down mixed that using convert format. The resulting output looks like the attached, you can see 25Hz is missing, i.e. channel 4 aka no LFE in the output.

Has something changed in how jrss downmixing works? or is this just broken? or is there some other config to apply to include LFE in the output?

FWIW I put the source wav file at https://drive.google.com/file/d/0BxdmSMpV-t3GSTNCTlBiRjJFSEk/view?usp=sharing

Hendrik:
Are you sure you didn't set the Output Format DSP to silence the LFE? Because it definitely works for me, the 4th channel is even 10dB amplified like it ought to be.

mattkhan:
which setting do you mean?

as far as I can see, my config is as per that link, specifically

http://www.avsforum.com/photopost/data/2122237/c/cf/cfebc70f_AudioConversionOptions.jpeg
http://www.avsforum.com/photopost/data/2122237/b/b1/b1dd4e7f_ParametricEqualizer.jpeg

so mono output with jrss mixing and a single PEQ to adjust level

Hendrik:
There is only so many settings that affect the LFE/Subwoofer on the output format DSP page, basically one. That one.  :P
The screenshots are old, the setting is relatively new (its there, but greyed out for downmixing in the screenshots).

mattkhan:
this is what I have

note the subclarity checkbox appears to be disabled (though it's not obvious with this skin)

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