Doepfer

Here is my modular as of now:

A110 - VCO
A110 - VCO
A145 - LFO1
A146 - LFO2
A138b - Log Mixer
A140 - ADSR
A140 - ADSR
A131 - Exp. VCA
A180 - Multiples
A180 - Multiples
A190 - MIDI Interface
A102 - Diode LPF
A124 - WASP Filter
A137 - Wave Multiplier
Polivoks - Russian LPF/BPF

This is all in a mahogany case that I made, very similar to the
Doepfer suitcase, using the DIY kit.

Here's the deal, I have some more room left, but not a lot.  It's
definitely starting to fill up, so I need to be careful about what
else I put in this thing, that it will truly be useful.  So far, this
thing sounds pretty good, but I have to be honest.  It does not sound
like a $2000 synth, which is about what I've put into it so far, but I
know what these things are capable of, so I have to be missing some
key element to fatten it up.  Right off the bat, I'm thinking I need
the A-115 divider/suboscillator module.  But is that it?  If it helps,
I am making industrial music, so thick, harsh sounds are my goal.  Is
the A-115 the key element that will make this thing make people go
"WOW that sounds awesome!" or is there something else I need to add as
well?

Also, if it is indeed the A-115 that I'm needing, where would you
"typically" patch that in?  Do you bring two oscillators into a mixer,
then sub-oscillate the mixed signal?  Or do you just sub-oscillate one
oscillator, pre-mixer?
Thanks!