just posting this in case someone has done exactly this with success....

set-up:
mac powerbook alu (the shit one with the cpu of an led watch) - FW800 version.
mac os x 10.3 something
ableton live 6
edirol ua-20
EMU E6400 (external sampler)
Roland PC300 kybrd cntrllr
Novation sl remote 100

desire:
midi control of EMU external sampler from within LIVE 6
audio from E6400 tp be recorded in LIVE.

i have tried:
all possible power up sequences
implementation of UA-20 advanced driver switch before,during and after Live 6 initialisation
creation + configuration of new midi ports in MAC OS x Audio/Midi set up

results:
cant see the Edirol as a midi device in ableton live 6 (but can see it as AUDIO i/o option)
can see the pc 300 as midi device - in fact LIVE seems to pick this device as its #1 favourite default midi
can see the nOVATION as midi device in LIVE
PC300 midi out direct to EMU samper - works fine (but i want midi control from LIVE)

QUESTION
there is a midi routing app quoted often here - cant remember what it is called though
can anyone guide me to it?
is it all a driver issue between OSX and Edirol ( checking their site in a minute)?
should i accept the LIVE choice of the PC300 as 'dominant' midi out and look for a midi link to the emu VIA the pc300 ( i dont know if the pc300 accepts an incoming midi signal via usb - it does have a midi out but is this intened solely for independently linking to external synths?

any answers?

R-E-S-P-E-C-T

What's the OS X version exactly? (apple menu/about this mac)
Have you removed the drivers of the Edirol and reinstalled them AND repaired permissions using the Apple Disk utility?
Does the edirol show in the usb gear in the systems information (apple menu/about this mac/more info/USB)? (it should)
The MIDI routing app… is it apps/utilities/audioMIDI setup?

....loving the alien...

osx 10.3.9
edirol only shows up when plugged in (mid switch set to on before connection)
i installed latest driver - now the edirol shows up in LIVE 6 midi preferences + as a midi oputput option in the track(in live) - all wonderful

i think i may have screwed up the settings in the audio mid setup because the midi signal seems to get as far as the computer but not into and out of the edirol ua-20

cheers little alien dude - watch out here come the men in black

update

edirol ua-20 showing up all over - in daw - in 'audio/midi setup' - in 'about this computer'

i plugged the midi output of the UA-20 into a Design Labs Prologue Plus (has a built in midi analyzer)
and this recognized the midi signal showing bothe the background signal and the note on/off

when plugged into the e6400 - only a very dim but constant midi receive light - no brighter pulses for on/off (which i would expect) (but works fully with a direct midi signal from a PC300 kybrd.......

so all the gear is doing what it says it can....up to the point where it goes into the e6400

voodoo

(i suppose all li am left with is power up sequence testing, or sneaking up on the sampler dressed in black in a dark studio)

que faire petit homme du mars ?

The stoopid trick: have you tried to switch MIDI cables?

In case the audioMIDI setup is screwed in some way, trash the files in user/libraries/

-/audio/midiconfigs/Defaults.mcfg (or whatever you called it)
-/preferences/com.apple.audio.AudioMIDISetup.plist

Why is the E-mu not plugged into the UA-20 MIDI ports?

The PC-300 is bus powered only or can it be main powered (wallwart)?