Analogue-sequencer

>>If you can afford to have both, and have the ARP triggered
externally so it syncs to the rest of your gear, I'd say have/keep both.  
Paul did.  I did.  Many others have as well.<<

yowsa. in fact, some of us are a little sequencer-retentive, & have
ended up in some sort of sequencer-hell because of our over-indulgence.
:-)
there's something about running a pro-1 or a little moog from an
analogue sequencer... whatever it is, it disappears (i.m.o) when the
same arp (or roland 104, or w.h.y.) is clocked over midi.

OT- jez- rather a convoluted route to answer a simple question, but
here goes: the little lights are from a computer shop (e.g. maplin), &
come with a USB plug on them. 
it's a tricky operation, but you can replace the USB plug with an XLR
& then add a corresponding socket to the back of y'r controller
keyboard. find the 5V regulator & take a feed off that via a
several-hundred-ohm resistor. the hard part is trimming back the
spring-steel goosenecky stuff to get at the wires inside.
emu saw fit to provide a bnc connector on the command stations for
such purposes- I wonder if colin could be persuaded to add one to the
p3..?

d./r.m.i.