I've found that these all work. However, I take no responsibility of the accuracy of this document. These are the sort of things that you should be able to find out from Turtle Beach's documentation. They must think that just because you were stupid enough to buy their product you must be too stupid to use midi commands!
none:
B0 63 00 B0 62 01 B0 06 00
room 1:
B0 63 00 B0 62 01 B0 06 01
room 2:
B0 63 00 B0 62 01 B0 06 02
room 3:
B0 63 00 B0 62 01 B0 06 03
hall 1:
B0 63 00 B0 62 01 B0 06 04
hall 2:
B0 63 00 B0 62 01 B0 06 05
plate:
B0 63 00 B0 62 01 B0 06 06
delay:
B0 63 00 B0 62 01 B0 06 07
pdelay1:
B0 63 00 B0 62 01 B0 06 08
pdelay2:
B0 63 00 B0 62 01 B0 06 09
none:
B0 63 00 B0 62 02 B0 06 00
ch1:
B0 63 00 B0 62 02 B0 06 01
ch2:
B0 63 00 B0 62 02 B0 06 02
ch3:
B0 63 00 B0 62 02 B0 06 03
ch4:
B0 63 00 B0 62 02 B0 06 04
chwf/b:
B0 63 00 B0 62 02 B0 06 05
flng:
B0 63 00 B0 62 02 B0 06 06
delay:
B0 63 00 B0 62 02 B0 06 07
delayf/b:
B0 63 00 B0 62 02 B0 06 08