Hi (Takashi?)! The OSS emulation in ALSA is slightly wrong regarding number of requested buffers. To quote from my own "notes to self" from own source: /** Setting up the soundcard for CD-HiFidelity Stereo * */ audio.path = "/dev/dsp"; audio.speed = SAMPLERATE; audio.format = AFMT_S16_LE; audio.is_stereo = TRUE; // 3 buffers of 256 bytes == 3 * 64 (16bit) stereo samples // 0x0002 buffers == n - 1, although Alsa (mis)interpretes oss buffers // == n!!! Use 0x0003! // // 0008 bytes == log2(number of bytes in buffer), 2^8 == 256 == 64 // stereo samples; audio.bufsize = 0x00030008; ... so ALSA UNDERSHOOTS the number of buffers BY ONE (which of course will not work for RT-people on the edge.) mvh // Jens M andreasen PS: Thanks to the mdk10.1 beeing distributed on DVD by LinuxFormat this month, work is ongoing for a clean alsa solution of my handyworks ... DS