Hi Mark

> * Is installing the +5v adaptor straightforward

like the cable of a standard module.

> * Do I need an adaptor for each +5v module or how many can I run from one adaptor

not necessarily. http://www.doepfer.de/a100z_e.htm says up to 100mA. Pay
attention: this is the current on the 5V rail, not the all over current
consumption of the modul.

Florian