port-i386: Only one speaker sound

Subject: Only one speaker sound
To: None <port-i386@netbsd.org>
From: Rui-Xiang Guo <rxg@ms25.url.com.tw>
List: port-i386
Date: 05/01/1999 11:44:56

Hi,
I use NetBSD-1.4_BETA with sb0 sound driver. My soundcard is sb16 
non-PnP. When I run xmcd and xwave, I found that only one speaker sound.
How to fix it?
Thanks for your help!