By now there are quite a few remote control devices available for all kinds of hardware synths and drum machines. The ones listed here are all free and built with Max for Live. They all require Live 9 and Max 6.
Volca Beats Remote CC by achillez909
Volca Beats Drum Rack and Remote by Nerk
Volca Bass Remote CC by achillez909
Korg Volca Bass Remote by Nerk
Nord Lead 2X Remote by Protonica
Bass Station II Interface with M4L Presets by TBTAHG
Roland AIRA TB-3 Remote by Protonica
Roland AIRA TB-3 Remote by Nerk
Roland AIRA TR-8 Drum Rack and Remote by Nerk
Roland FA 06-08 Control by aevin
Roland System-1 Remote CC by achillez909
This way for heaps more Max for Live devices & tips.