Elektron Musical Instruments

I have two kicks in a certain kit, one triggering the other.
I can hear marked fluctuations in volume and pitch when I
trigger both, even when the second kick is just a transient,
with no decay to speak of.

I'm getting this when I play through the MD's stereo bus,
because multitracking the MD isn't an option for me right
now.  I've tried subtle and wildly different variations on
the sounds, though I'd prefer to keep the machines as they
are.

How does one get around this?

-- 
Yours,
Niall.
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