jesolo was right i have connect the audio cable and installed the driver from the iso image sb16val_r1.iso downloaded from this site and now it's working but now there are a new problem...
in autoexec.bat the installation process add the following lines
SET SOUND=C:\SB16
SET BLASTER=A220 I10 D1 H5 P300 T6
SET MIDI=SYNTH:1 MAP:E
SET CTCM=C:\CTCM
C:\SB16\DIAGNOSE /S
C:\SB16\MIXERSE […]
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SET SOUND=C:\SB16
SET BLASTER=A220 I10 D1 H5 P300 T6
SET MIDI=SYNTH:1 MAP:E
SET CTCM=C:\CTCM
C:\SB16\DIAGNOSE /S
C:\SB16\MIXERSET /P /Q
C:\CTCM\CTCU /S
and when i boot the pc it say
Starting MS-DOS 7.1... […]
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Starting MS-DOS 7.1...
Creative Plug and Play Configuration Manager (v1.04)
Copyright (C) Creative Technology Ltd., 1995-1996. All rights reserved.
Your system configuration has changed.
Please run Windows 95 to inizialize your system configuration.
Press any key to continue...
and when i hit a key the boot will continue and the sound work...
this output is give by ctcm... it's a wrong version?
EDIT : i've tried to delete
SET CTCM=C:\CTCM
C:\CTCM\CTCU /S
but the message still appear, so i dont know why this appen...