I run everything from pc - 10 slots self powered usb hub. Then i send midi clock trough usb to couple of synths and like four controllers including beatstep pro. Then also i have midiface box and i feed two synths from there with midi. I connect two synths via midi split to beatstep pro, and because one synth has a keyboard, i want to connect to beatstep pro midi in, but like I said there is problem. Basically i have quite a bit of gear running at the same time, and they all connected to the same power source, i use like like four power socket extensions to feed evrth from one source. And yes there is a little bit of noise going when i turn them all on, but its bearable. But when i touch midi in of beatstep, ouch. And seems that it doesnt receive midi as well:(