Im also still in the beginning, but I guess the case is way to small except you are totally focused for a certain porpuse and know whar youre doing.
like building a additional FX or noise Box etc for your main case.
I dont know which external gear you want to pair with.
I guess:
1. a midi/cv-interface to pair it with external gear like a laptop or digitakt
like hexinverter mutant brain or others
- a nice filter
- vcas
- distortion / saturation
- a minimum of dynamics and processing
- lfos
look out for function combos like:
bastl ikarie = filter + drive+ vca
cosmotronic delta is a smal nice vca/envelope
a blackbox external or in the case could be cool for sampling drums if you dont use a laptop or digitakt. - I prefer it over the sample drum.
if you want to explore drums maybe you consider to get different drum modules with different synthesis styles like physical modeling, analog, fm etc - I guess more drum stuff will surely follow.
You need space for utilites like attenuverters
and stuff to scale, shift, offset and mix cv. - you will see what is missing while you are in the process.
I made the hard experience to start with a smal case. Now I pair 3 different sized cases at the moment.
Sure I can alter them for special purposes, but right now, Im looking for a nice all in one rack and to get rid of the others.
Better dont go under 7u 104.
And calculate some trial and error
Greetings
Chris