MOTM

ok so until i can get my modules in a case and get them over to my studio
safely, i would like some info from the resident gurus:
i have heard here that the modules require a 10v pk-pk input (or a preamp).
say i want to route my jp6 into the motm-800 ADSR --how do i know what the
jp6 puts out? is there a standard among analog synths? how about digital
synths? how about my bandmates' roland gr-30 guitar synth? do i just look
this up in the manuals or try it and see or what? can i use the motm 110
VCA/RM to boost a low input signal so that the other modules are getting
enough signal?

does any of this make sense? someone please set me straight, i have read
books and manuals and all the rest, however this is still a whole new
world....

mark