Custom kit in Session Drummer

When I load, say, a side stick sound from a wave file by right clicking on the snare, the snare only plays that sound, even though it's only the one note (37, I think). I want to be able to play note 37 and 38, but Session Drummer assigns my wave file to ALL the notes. I've tried selecting note 37 and loading a side stick, then 38 and loading a center hit, but it doesn't respect the various notes as the prefab kits do! I've even tried modifying a prefab kit by loading my own snare sound, but the problem remains. I can't play a song that has side stick AND center hits, because whatever the last sound I load, that's the one that sticks for all the notes. Any ideas? Thanks.

Thanks. I created this SFZ:
//  sfz definition file
//  (c) Zyler Vega Seth Perlstein Cakewalk, Inc 2009
//  Drums on Demand Custom Kit

//========================rimshot
<group>
key=37
group=37
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents\Kits\2 - Snares\DoD Snares\Blonde Rim.WAV

//========================snare medium
<group>
key=38
group=38
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents\Kits\2 - Snares\DoD Snares\Blonde Med.WAV

//========================snare soft
<group>
key=40
group=40
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents\Kits\2 - Snares\DoD Snares\Blond Soft.WAV

//========================snare loud
<group>
key=39
group=39
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents\Kits\2 - Snares\DoD Snares\Blond Loud.WAV
 
but when I try to load it as a snare I get this error:
 
File c:\program files\cakewalk\vstplugins\session drummer 3\contents\kits\2 - snares\dod snares\blonde med.wav not found or couldn't be loaded.
File c:\program files\cakewalk\vstplugins\session drummer 3\contents\kits\2 - snares\dod snares\blond soft.wav not found or couldn't be loaded.
File c:\program files\cakewalk\vstplugins\session drummer 3\contents\kits\2 - snares\dod snares\blond loud.wav not found or couldn't be loaded.


--- End of log for c:\program files\cakewalk\vstplugins\session drummer 3\contents\kits\2 - snares\dod snares\dod snares.sfz

Assuming the sfz file is with the rest of the snare sfz files, make the paths relative like this

//  sfz definition file
//  (c) Zyler Vega Seth Perlstein Cakewalk, Inc 2009
//  Drums on Demand Custom Kit

//========================rimshot
<group>
key=37
group=37
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=DoD Snares\Blonde Rim.WAV

//========================snare medium
<group>
key=38
group=38
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=DoD Snares\Blonde Med.WAV

//========================snare soft
<group>
key=40
group=40
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=DoD Snares\Blond Soft.WAV

//========================snare loud
<group>
key=39
group=39
polyphony=1
rt_decay=6.500
ampeg_release=2

<region>
sample=DoD Snares\Blond Loud.WAV

 
While this file should work, normally the snare samples would be triggered by the same note 38 at different velocities. Here is an example file. I implied the file considerably and equally divided the velocities. An equal split is not necessary and may not be desirable. Adjust the lovel/hivel values accordingly.

//  sfz definition file
//  simplified using Drums on Demand sample

//========================rimshot
<region>
key=37
sample=DoD Snares\Blonde Rim.wav

//========================snare
<region>
key=38
lovel=0
hivel=42
sample=DoD Snares\Blonde Soft.wav

<region>
key=38
lovel=43
hivel=84
sample=DoD Snares\Blonde Med.wav

<region>
key=38
lovel=85
hivel=127
sample=DoD Snares\Blonde Loud.wav