The EASy68K trap tasks that use the DirectX player support playing multiple sounds at the same time. Those trap tasks are: 74, 75 and 77. See EASy68K help for details.
Code:
ORG $1000
START
* Load sounds into memory
lea zero,a1 load "zero" wav
move #0,d1 sound number 0
move #74,d0
trap #15
lea one,a1 load "one" wav
move #1,d1 sound number 1
move #74,d0
trap #15
lea roger,a1 load "roger" wav
move #2,d1 sound number 2
move #74,d0
trap #15
* Play sounds from memory
move #1,d1 play "one"
move #77,d0
move #0,d2 play sound once
trap #15
move #0,d1 play "zero"
move #77,d0
move #0,d2
trap #15
move #2,d1 play "roger"
move #77,d0
move #0,d2
trap #15
loop bra loop
MOVE.B #9,D0
TRAP #15 Halt Simulator
roger dc.b 'roger.wav',0 sound file
zero dc.b '0.wav',0
one dc.b '1.wav',0
END START