zero.
please provide a link where true piano can be downloaded.
and i will give it a whirl here .

i can only download smaller plug ins cos i have to reserve bandwidth
for songs i do with other folks else i get extra charges from my isp.
it would be best if you did the following.
post a pic of both your audio and midi settings in preferences.
plus as rharv has a delta sound device post a pic of its settings too in its user
control panel. i dont have a delta.

if your not hearing sound look at the midi channel setting on the trak.
if the midi channel setting is set to lets say channel 5 but tp expects
midi channel 1 for piano possibly thats why you cant hear playback.
set the trak to midi channel 1.
run this rough test.
1. load up a known piano midi trak that plays under win media player.
2. instantiate n load the tp in the top slot.
n press play.
do you hear sound ??
if not look for settings in tp re midi channel compared to the traks midi channel.

i'm assuming your au fait bout the importance often of setting midi channels in
traks and devices correctly ??
for example a common set up prob is lets say one device is transmitting on
channel 3 but the receiving device is set to receive on midi channel 5 ...
no sound cos the receiving device isnt set to 3.
its sorta like a telephone line..gotta have the right number dialed in.
make a note of your axiom settings and what midi channel its set to send on.

hth.

retired puter engr....powertracks on amd......NICE !
"what is the black art of audio engineering ?"
my silly songs...motagator.com/bmanning
see my tips in the tips section.