sound issue

[Philo <philo.netbsd%free.fr@localhost>]

Hi,
I've an xeon (i386) computer. NetBSD 7.0 and pkgsrc-2016Q1 are installed.
i've 5.1 sound card, i want to listen song on this machine.
The sound card works fine under Debian system since another hard drive.
dmesg's command see the card, it is installed un plugged by the 
operating system.
this the output message issue :

1/ Audiomixer
GStreamer was unable to detect sound devices, some sound system specific,
GStreamer packages may be missing. it may also be a permission problem

2/ Rhythmbox
couldn't start playback
the specified location is not supported

I hope that some one have idea for get around this issue

Regards
Philippe