3x Behringer Neutrons - what do I do with them?

So I figured I need to explore modular synthesis a little.

Buy 24 eurorack modules? or buy 3x Behringer Neutrons?

I followed the second path and am now trying to expand my knowledge ...

EXPLORATIONS

After some thinking about the sound ideas outlined further below makes me aware of how i dont understand the relative voltages,
LFO             -5v to 5v
LFO UNI      0v to 5v
ENV              0v to 9v

VCA CV        -9v to 9v
ATT1 CV        -5v to 5v

_+_+_+_
Patch test, compare the LFO outputs vs the ENV outputs on the VCA CV, and the ATT1 CV.

How does the LFO work as a VCA modulator?

How does a slow square LFO against constant ENV values compare on OSC pitch

Ideas.

Slew as a third envelope - ASR
TRIGGER > SLEW IN . SLEW OUT > ATT 1 CV 

SLEW rate for attack/decay time, or via ATT2 for height.

ENV out            0V to 9V
SLEW out           -9.5V to 9.5V
ATT1 CV in    voltage range -5V to 5V . excess V will be truncated.

Multiple Stages by using Pitch - constant AR time.

BSP pitch out          0V to 10V
Neutron Pitch out     0V to 5V

each OSC with their own ENV 

OSC1 > VCA
ENV1 preconfigured
VCA > ATT2 for volume reduction?
ATT2 > SUM1

OSC2 > ATT1 IN
ENV2 > ATT1 CV
ATT1 > SUM1

SUM1 > VCF
VCF is output
VCF > DELAY IN

problem with ENV2 output 0 to 9V, ATT1 CV input -5 to 5V. so VCA needs to be attenuated? or how to gain ATT1?

how about using pitch to generate 5V, first add the inverted to the envelope to move into range -5V to 4V, then add 5V to ATT1 .. oh wait, that would truncate the OSC output in the negative range ..

LFO to mix between OSC - imagining CV input to the OSC MIX knob

1) use LFO on VCA for OSC1 and inverted LFO on ATT1 for OSC2 - no GATE envelope? maybe use env2 on filter?
....
OSC1 > VCA
OSC2 > ATT1
LFO UNI > MULT

MULT1 > VCA CV
MULT2 > INVERT >ATT1 CV

VCA > ATT2
ATT1 + ATT2 > SUM1
SUM1 > VCF IN
VCF1 is output, run through DELAY to get main output.

again ATT1 range will be half so, something needs to go through ATT2, could be OSC1, or ENV1, or VCA

2) or can I phase invert for silence? invert OSC MIX then run through ATT1 and sum with OSC1

OSC MIX > INVERT
INVERT > ATT1 IN
LFO  > ATT1 CV

OSC 1 + ATT1 > SUM1
SUM1 > VCF

.. if 2 works, then could also use ENV2 to control the mix