If you dont have 9 Custom sounds, try the same sounds with other alternative ones for slash and hit.
eg.
Code:
new KNIFE_SLASH1[] = "knife/knife_slash1.wav"
new KNIFE_SLASH2[] = "knife/knife_slash1.wav"
new KNIFE_HIT1[] = "knife/knife_hit1.wav"
new KNIFE_HIT2[] = "knife/knife_hit1.wav"
new KNIFE_HIT3[] = "knife/knife_hit1.wav"
new KNIFE_HIT4[] = "knife/knife_hit1.wav"
And make sure you enable the cvar before you turn on our server so it will be precache. For the models, you need 2 one for the v_knife and p_knife; Since you cant drop you knife in cs, there is no world model for it.
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HDD fried, failed to backup files. Sorry folks, just don't have free time anymore. This is goodbye.