Doepfer

im looking into building up a good modular synth, and in order to do 
this id like to be able to mix and match modules from different 
manufacturers.  the most confusing aspect of this is the power 
supply.  id like to use doepfer a-100, analogue systems, blacet and 
syntech motm modules, but will i need four different power supplies 
for these, that could get quite costly...  doepfer uses a bus system, 
but could the modules be modified to work with another power supply, 
preferably a star system like motm.  any help is greatly 
appreciated.  thanks

denshi