Couple things.
Disable the extra sound stuff and re-test.
If still goofy...
ENABLE the DEFAULT SOUNDS (sub)MOD and re-test.
If still goofy...
If you have a SB card, ensure that EAX is disabled.
Check conf.ini under the [SOUND] section and ensure:
SoundFlags.hardware=0
SoundFlags.forceEAX1=1
Retest.
Then DISABLE (remove) the DEFAULT SOUNDS (sub)MOD and re-enable the Tiger Flyby
Retest.
Report back.