Some .prs file needs editing for sure.
for example, motor.DB-600_Series.start.begin.prs in UV3:
[common]
mode relobj pos
type mixer
undetune 1
[spl]
[samples]
adb605_start.wav
axdb605_start.wav
[sample.adb605_Start.wav]
env 2 8
infinite 1
controls start
[sample.adb605_start.wav.start]
minlo 0
minhi 0
maxlo 300
maxhi 300
value 4.0
pmin 1.0
pmax 1.0
[sample.axdb605_Start.wav]
env 0
infinite 1
controls dist
[sample.axdb605_start.wav.start]
minlo 0
minhi 0
maxlo 300
maxhi 300
value 4.0
pmin 1.0
pmax 1.0
[sample.axdb605_start.wav.dist]
minlo 0
minhi 0
maxlo 100
maxhi 200
value 4.0
pmin 1.0
pmax 1.0
edited by me, edits in bold:
[common]
mode relobj pos
type mixer
undetune 1
infinite 1
[spl]
[samples]
adb605_start.wav
axdb605_start.wav
[sample.adb605_Start.wav]
env 2 8
infinite 1
controls start
[sample.adb605_start.wav.start]
minlo 0
minhi 0
maxlo 300
maxhi 300
value 4.0
pmin 1.0
pmax 1.0
[sample.axdb605_Start.wav]
env 0
infinite 1
controls start dist
[sample.axdb605_start.wav.start]
minlo 0
minhi 0
maxlo 300
maxhi 300
value 4.0
pmin 1.0
pmax 1.0
[sample.axdb605_start.wav.dist]
minlo 0
minhi 0
maxlo 100
maxhi 200
value 4.0
pmin 1.0
pmax 1.0
basically, for the problem here, delete the "infinite 1" entries in individual wav section and add one at the start of the file. That should be it. Do the same for motor.DB-600_Series.start.end.prs. freeware mods man freeware, gotta dig in deep yourself...