SoundBridge konvertiert die Files so, daß das DMpro die verarbeiten kann! Das sollte meiner Meinung nach kein Problem sein.
Ich habe einen "Trick" im Netz gefunden, weil ich selber Probleme hatte, die hochgeladenen Samples zuzuweisen bzw. anzusprechen (ist in englisch). DAS steht so nämlich nicht im Handbuch:
"
This is not very well documented by Alesis, but here is the scoop!!
Firstly, in using your own samples, you can only "create" single-
voice drums. (with the pre-programmed Alesis sounds, you can layer
up to 4 "Sounds" to make a drum, each with varying
characteristics....). So, when you create a new drum with your own
sample, you assign your sample (called "Voice" by Alesis) to
a "Sound", say Sound1 and dis-able Sounds2,3,4.
The procedure is documented on page 64 of the manual, "The VOICE
SELECT Function" under the Programming Drums Chapter.
So under Drum Edit mode, your first page is the SOUND ENABLE
parameter, which as mentioned, enable 1, disable 2,3,4. Then move to
Page 2, which is the VOICE GROUP parameter. This is where it gets
fuzzy. The manual lists 13 Voice Groups, each group containing a
number of "Voices" (samples) that you can assign to that Sound.
These are listed on the bottom of page 64 in the manual. Per Alesis,
you select the Voice Group, then move to page 3 where you select the
actual Voice that will occupy the Sound you are working on.
HERE'S the super-secret!!! (What Alesis does NOT TELL YOU IS ....
If you have a RAM card plugged in, and you have successfully
downloaded your groups created in Alesis Soundbridge (you can make up
to 8 named groups, with as many samples in each group as your card
will hold.), THEN, THESE GROUPS ARE APPENDED TO THE LIST, AND YOU
SELECT FROM THEM JUST LIKE YOU WOULD SELECT FROM THE ALESIS GROUPS.
For example, if you created a group in SoundBridge, named "MySnar" (I
think you are limited to the first 6 letters by the DMPro display)
and then added 10 different snare samples, each with their own name
to this group, then after the Alesis Voice Group "Chrmtc" the
name "MySnar" would show up. If you select it, and move to P3, then
your 10 samples would show up as selections, and you could assign one
of them.
NOTE: you HAVE to keep the sound card plugged in to access your
samples. The DMPRO does NOT "load" or store them in any on-board
memory.
From here, it is just like the manual says, you assign your sample as
a Voice, to a Sound, which is assigned to a drum, which is used in a
DrumKit.
"
Viel Erfolg 
!
Oh, wie traurig!
! Ich habe an meinem DMpro ganz viele Split-Kabel hängen. "Umschalten" kann es nicht.
, von Versand und Steuern mal abgesehen.
) kostet obiges Bundle auch nur knapp 330,- mehr (nur Rack passend zum Bundle: 344,-).