Oops -- that's right, 3.5mm is roughly 1/8".
If you want to use a second mic that will not be powered by the Rolls
box, just disconnect one of the female XLR cables from the Rolls
output and attach the second mic cable to it. Now you have one mic
cable passing through the Rolls, and one that bypasses it. Both
connect to the "Y" cable that ends in the 3.5mm plug. This way the
Rode mic will be recorded on one of the channels, and the second mic
on the other.
This is one case where a picture is much better than words.
The Rolls box is powered by two 9v batteries. Making the giant leap
of faith that each battery powers one mic, it might be possible to
take one battery out and use its channel, now unpowered, to connect to
the mic that has its own power module.
If you want to try this approach, be sure to check the phantom power
delivered to the mic cables using a multimeter before attaching your mic.
--oryoki
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