Hi, Thanks for the replies, all. I get the noise regardless of whether I run Jack from the console or qjackctl so that is not the cause. I could basically record the noise to an external recorder. As said - the captured audio is always clean. This noise comes in in between the capture and playback. In other words it is either Jack, Alsa or the card. Is there a way I coud get Jack to run without -S and with a -p greater than 1024 with 6 input channels? Error message below. -Jorma [jorma@turpea jorma]$ jackstart -v -R -dalsa -dhw:0 -r44100 -p2048 -n2 back from read, ret = 1 errno == Success getting driver descriptor from /usr/lib/jack/jack_alsa.so getting driver descriptor from /usr/lib/jack/jack_dummy.so jackd 0.94.0 Copyright 2001-2003 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details registered builtin port type 32 bit float mono audio capabilities: =i cap_setpcap,cap_ipc_lock,cap_sys_nice,cap_sys_resource+ep loading driver .. new client: alsa_pcm, id = 1 type 1 @ 0x8058b40 fd = -1 apparent rate = 44100 creating alsa driver ... hw:0|hw:0|2048|2|44100|0|0|nomon|swmeter|rt|32bit control device hw:0 configuring for 44100Hz, period = 2048 frames, buffer = 2 periods Couldn't open hw:0 for 32bit samples trying 24bit instead ALSA: cannot set period size to 2048 frames for capture ALSA: cannot configure capture channel cannot load driver module alsa __ Sano ei kuukausimaksuille. Hanki Suomen ainoa aidosti kuukausimaksuton GSM-liittymä osoitteesta http://www.saunalahti.fi