jackd distorts sound (chopping and scratching)

Hello guys, this is me:
Ubuntu-studio
$ uname -a
Linux castle 3.2.0-23-lowlatency #31-Ubuntu SMP PREEMPT Wed Apr 11 02:24:03 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
 - Started jack:
$ jackd -dalsa -s
Get sound chopped, desincronized and distorted from vlc, qmmp just dies and hanges until I kill jackd
===================================================================================
$ jackd -dalsa
jackdmp 1.9.8
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2011 Grame.
jackdmp 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
JACK server starting in realtime mode with priority 10
control device hw:0
control device hw:0
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
JackProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Driver is not running
Cannot create new client
Unknown request 4294967295
jackd: ../common/JackGraphManager.cpp:44: void Jack::JackGraphManager::AssertPort(jack_port_id_t): Assertion `port_index < fPortMax' failed.
Aborted (core dumped)

vlc reduced to sink sound and killed jack.... The same with qmmp
========================================================
jackd -dalsa "hw0:0" -zshaped -D -i2 -o2 -r96000 -s
works, but distorts, chops and slows audio 2 times down instead of resampling, using vlc.
qmmp just hangs and dies only after jackd killing.
========================================================
jackd -dalsa "hw0:0" -zshaped -D -i2 -o2 -r96000
dies as jackd -dalsa
========================================================
Though, alsasink opens any time I start jack
$ cat /proc/asound/CA0106/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 96000 (96000/1) //or 48kHz
period_size: 1024
buffer_size: 2048

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: jackd 5
ProcVersionSignature: Ubuntu 3.2.0-23.31-lowlatency 3.2.14
Uname: Linux 3.2.0-23-lowlatency x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Sat Jun 9 20:56:02 2012
InstallationMedia: Ubuntu-Studio 12.04 "Precise Pangolin" - Beta amd64 (20120421)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: jackd-defaults
UpgradeStatus: No upgrade log present (probably fresh install)