If you had a slightly limited semi modular you might like to explore creative usage of low voltage sources, like the cue outs from the OT 
Elektron’s Troberg used the OT to sync a monotribe for example, some analog components, like resonant filters are nice to ping, plus some gates will work at lower levels that 5v, even in the 1v range
Using audio level noise as a mod source gives very nice fizz to certain mod destinations and you could even use an iphone with an LFO to give good levels for vibrato duties
The A4 cv tracks are good for all sorts, especially if you use Value Lin and get busy with LFOs and ENVs
The A4 even lets you modulate the source track for cv info, that’s nicely experimental, plus they recently enabled MW/AT etc as control params which your own midi:cv may not have
Experiment, but be careful with where you put the high voltages