Yes modulation is way more important than too many voice oscillator modules. If you want to keep the smaller case, consider smaller sized hp modules that perform these modular tasks like 0chd from Divkid that is way smaller than Rampage and still gives you tons of modulation. Also consider getting a quad VCA module and attenuator. A filter would be great add on as well.
-- benscott
Many thanks, your answer helps a lot .