Totally not easy! I've read somewhere that for most usage, it's not too necessary to have buffered mults, and in my experience (which is limited!) my 2hp Intellijel passive mult has worked fine for everything i've plugged into, and i've even split audio signals through it with no real problems. I went the path of getting a number of smaller or multi-function modules for my 3U set up, such as the Disting, the 2hp Qu-bit EON (envelope/osc/lfo/noise), and the 2hp MengQi dual LPG which is a passive 2-channel VCA type module. As I've been building my rack I also realized how important it is to have enough envelopes and vcas!