I have a Zoom H4n recorder and would like to use it as an interface on a
laptop with Ubuntu 10.04.. I've succeeded in using it to record and to
play audio independently via jack but not together in duplex mode.
I've read on the web that people have used the H4n with full duplex. Can
anyone suggest what might be wrong with my set up?
No problems using the built-in sound card of the laptop in duplex mode
I'll paste below the verbose messages from qjackctl.
07:23:26.322 Patchbay activated.
07:23:26.334 Statistics reset.
07:23:26.339 ALSA connection change.
07:23:26.356 Startup script...
07:23:26.357 artsshell -q terminate
07:23:26.402 ALSA connection graph change.
sh: artsshell: not found
07:23:26.829 Startup script terminated with exit status=32512.
07:23:26.830 JACK is starting...
07:23:26.830 /usr/bin/jackd -v -dalsa -dhw:1 -r48000 -p256 -n3 -Xseq
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
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
getting driver descriptor from /usr/lib/jack/jack_oss.so
getting driver descriptor from /usr/lib/jack/jack_net.so
getting driver descriptor from /usr/lib/jack/jack_dummy.so
getting driver descriptor from /usr/lib/jack/jack_alsa.so
getting driver descriptor from /usr/lib/jack/jack_firewire.so
07:23:26.845 JACK was started with PID=5059.
no message buffer overruns
JACK compiled with System V SHM support.
server `default' registered
loading driver ..
registered builtin port type 32 bit float mono audio
registered builtin port type 8 bit raw midi
clock source = system clock via clock_gettime
new client: alsa_pcm, id = 1 type 1 @ 0x84ea9c8 fd = -1
apparent rate = 48000
creating alsa driver ... hw:1|hw:1|256|3|48000|0|0|nomon|swmeter|-|32bit
control device hw:1
configuring for 48000Hz, period = 256 frames (5.3 ms), buffer = 3
ALSA: final selected sample format for capture: 16bit little-endian
ALSA: use 3 periods for capture
start poll on 3 fd's
ALSA: final selected sample format for playback: 16bit little-endian
ALSA: use 3 periods for playback
new buffer size 256
registered port system:capture_1, offset = 1024
registered port system:capture_2, offset = 2048
registered port system:playback_1, offset = 0
registered port system:playback_2, offset = 0
+++ client is now alsa_pcm active ? 1
client alsa_pcm: internal client, execution_order=0.
registered port alsa_pcm:Midi-Through/midi_capture_1, offset = 1024
registered port alsa_pcm:Midi-Through/midi_playback_1, offset = 0
ALSA: could not start playback (Broken pipe)
DRIVER NT: could not start driver
cannot start driver
starting server engine shutdown
server thread back from poll
freeing shared port segments
stopping server thread
stopping watchdog thread
last xrun delay: 0.000 usecs
max delay reported by backend: 0.000 usecs
freeing engine shared memory
max usecs: 0.000, engine deleted
cleaning up shared memory
cleaning up files
unregistering server `default'
07:23:26.937 JACK was stopped successfully.
07:23:26.939 Post-shutdown script...
07:23:26.940 killall jackd
07:23:27.032 ALSA active patchbay scan...
jackd: no process found
07:23:27.354 Post-shutdown script terminated with exit status=256.
07:23:29.044 Could not connect to JACK server as client. - Overall
operation failed. - Unable to connect to server. Please check the
messages window for more info.
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