@JimHowell1970
Thanks for your suggestions. I was aware that my tiny box loaded with uncool Behringer modules won't be regarded as the latest hip thing in this community. One thing I want to avoid is to expand to a full blown modular system so buying a bigger case is no option for me.
@adaris
I guess you are right. I'll swap the bulky 995 with a Doepfer A-138n and a Doepfer A-145-4.
This would make my little effects box even more mediocre. But if anybody can give me an advice how I can fill up the 8HP from the 995 with flashy modules that suit my desire (at least 3 attenuators and a flexible LFO to modulate the Z5000) I might follow these suggestions. Thanks!