[TESLA-X4]

Use SNDCHAN_STATIC instead of SNDCHAN_AUTO.

By this I mean changing line 216 from:
EmitSoundToClient(i, TheSound, client, _, 150, _, fns_volume, PitchR);

To:
EmitSoundToClient(i, TheSound, client, SNDCHAN_STATIC, 150, _, fns_volume, PitchR);

Using this channel (6), multiple sounds can be overlapped.

Hope this helps