[linux-audio-user] Jack/Hydrogen problem

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I start Jack with qjackctl and everything's fine with Ardour. But when I 
try to start Hydrogen, it says "Error starting audio driver". I have 
tried to change jack as audio driver and restart it, but the same error 
message appears. With alsa driver it works fine.

system information:
Mandriva LE 2005
2.6.11-9.mm.9mdk

 From the console (it says Jack is not running, though it is - and I am 
not running jack as root):

$ ./hydrogen
Warning: no locale found: 
/home/linna/hydrogen-0.9.2-x86/bin/data/i18n/hydrogen.fi_FI

Hydrogen 0.9.2-x86 [Jul 20 2005]  [http://www.hydrogen-music.org]
Copyright 2002-2005 Alessandro Cominu


Compiled modules:  (FLAC) (Jack) (Alsa) (OSS) (LRDF)

Hydrogen 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

Using data path: /home/linna/hydrogen-0.9.2-x86/bin/data
[WARNING]   SongReader          [readXmlString] Using default value in 
drumkit
[LadspaFX::load] INIT - /usr/lib/ladspa//tap_reverb.so - tap_reverb
[WARNING]   LadspaFX            [LadspaFX::load] integer hint not 
implemented yet
[LadspaFX::getPluginList] reading directory: /usr/lib/ladspa/
[LadspaFX::getLadspaFXGroup]
[LadspaFX::getPluginList] reading directory: /usr/lib/ladspa/
[WARNING]   JackDriver          Jack server not running?
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Error 
starting audio driver [audioDriver::init()]
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Error 
starting audio driver
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Using 
the NULL output audio driver
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] 
m_pMainBuffer_L== NULL
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] 
m_pMainBuffer_R== NULL
[ERROR]     Hydrogen            [audioEngine_setupLadspaFX] nBufferSize=0
[ERROR]     NullDriver          [setBpm] not implemented yet
[ERROR]     LocalFileMng        [loadDrumkit] Load Instrument: Data file 
/home/linna/hydrogen-0.9.2-x86/bin/data/drumkits/CVS/drumkit.xml not found.
[ERROR]     MainForm            [errorEvent]
[WARNING]   JackDriver          Jack server not running?
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Error 
starting audio driver [audioDriver::init()]
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Error 
starting audio driver
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] Using 
the NULL output audio driver
[ERROR]     NullDriver          [setBpm] not implemented yet
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] 
m_pMainBuffer_L== NULL
[ERROR]     Hydrogen            [audioEngine_startAudioDrivers] 
m_pMainBuffer_R== NULL
[ERROR]     Hydrogen            [audioEngine_setupLadspaFX] nBufferSize=0
[ERROR]     MainForm            [errorEvent]


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