No sound in flashplayer video

I'm not sure to have understood (I'm very poor with english and FreeBSD), anyway I have removed these 2 lines from /etc/sysctl.conf:
Code: 
hw.snd.default_unit=1
hw.snd.compat_linux_mmap=1
and I have upgraded from ports the packages: alsa-lib, linux-f10-alsa-lib and linux-f10-alsa-plugin-oss. After reboot the problem is still here.
 
Please, show the following outputs:
# uname -a; sysctl compat.linux | head -2; pkg_info -Ix alsa
 
Code: 
[damiano@pcbsd-8793] ~% sudo uname -a; sysctl compat.linux | head -2; pkg_info -Ix alsa
Password:
FreeBSD pcbsd-8793 9.1-RELEASE-p3 FreeBSD 9.1-RELEASE-p3 #0: Mon Apr 29 18:11:52 UTC 2013     root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  i386
compat.linux.oss_version: 198144
compat.linux.osrelease: 2.6.16
alsa-lib-1.0.26     ALSA compatibility library
linux-f10-alsa-lib-1.0.21_1 The Advanced Linux Sound Architecture libraries (Linux Fedo
linux-f10-alsa-lib-1.0.21_3 Advanced Linux Sound Architecture libraries (Linux Fedora 1
linux-f10-alsa-plugins-oss-1.0.21_3 OSS plugin for ALSA (Linux Fedora 10)
 
Code: 
# Kernel Options
kern.ipc.shmseg=1024
kern.ipc.shmmni=1024
kern.maxproc=10000

# Accept the firmware license
legal.intel_ipw.license_ack=1
legal.intel_iwi.license_ack=1

# Load additional sata device support
siis_load="YES"
sdhci_load="YES"

# Load geom support
geom_journal_load="YES"
geom_mirror_load="YES"
geom_eli_load="YES"

# Enable hardware crypto
aesni_load="YES"

# Load File-System Support
zfs_load="YES"
tmpfs_load="YES"

# Disable ZFS prefetch to improve performance
vfs.zfs.prefetch_disable="1"

# Disable acpi throttle by default, fixes issues with powerd and later AMDs
hint.acpi_throttle.0.disabled="1"

# Fix crashes on 32bit with Nvidia
machdep.disable_mtrrs=1

# Show keystokes for passphrases
kern.geom.eli.visible_passphrase=2

# Enable the graphical boot-loader
autoboot_delay="03"
graphics_enable="YES"
beastie_theme="/boot/themes/default/theme.conf"

# Load splash screen
#splash_pcx_load="YES"
#bitmap_load="YES"
#bitmap_name="/boot/loading-screen.pcx"

# Speed up boot
kern.cam.scsi_delay="500"

# Adjust system kern.hz
kern.hz=100

# Placeholder for future ZFS TRIM support in 9.2/10
# vfs.zfs.trim_disable=0
nvidia_load="YES"
 
Show output # /compat/linux/bin/sh /usr/bin/ldd /compat/linux/usr/lib/libflashsupport.so

Be sure your default sound device is pcm0
Code: 
# sysctl hw.snd.default_unit
hw.snd.default_unit: 0

Have you installed pulseaudio? If so, read this thread.
 
Code: 
[damiano@pcbsd-8793] ~% sudo /compat/linux/bin/sh /usr/bin/ldd /compat/linux/usr/lib/libflashsupport.so
Password:
ldd: /compat/linux/usr/lib/libflashsupport.so: No such file or directory

In the graphic audio menu pcm0 is already selected, anyway I have added
Code: 
hw.snd.default_unit: 0
in /boot/loader.conf.
 
I can't install flashplugin-11. It makes the browser crash. Anyway I'm thinking that it can be a bug between browser and audio.
 
I don't know if it is a good idea. This problem with flashplugin-11 affects my PC on several distributions: Ubuntu, Debian, FreeBSD, Chakra, etc. and it isn't a sound problem but a crash problem (I think there is an incompatibility between flashplugin-11 and the old hardware of my machine).

Now I have two systems: Debian and FreeBSD, and both of them give the crash problem with flashplugin-11. Anyway on Debian I have solved using a previous version of the plugin, but on FreeBSD, with the same previous version, I have this sound problem.
 
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