Post edited 5:10 am – March 7, 2010 by sonorejr Post edited 5:11 am – March 7, 2010 by sonorejr Post edited 5:15 am – March 7, 2010 by sonorejr
Vortexbox Player (and most other MPD clients) allow you to contol volume digitally. When playing back ripped cds in 16/44.1 it's best not to employ digital volume control as you drop 8 bits of data. The solution is to add 8 bits in the first place so nothing is lost when digital volume control is employed. MPD can do this and it's pretty easy to do without much cpu usage. Further upsampling may be cpu intensive. Also, keep in mind that a 16 bit dac may have an issue with this change. The old saying applies…trust, but verify!
If you want to try it out add the following to the mpd configuration file in your output section between { }:
format "*:24:*" mixer_type "software"
Then add add the following to the mpd configuration file outside of the output section: samplerate_converter "Best Sinc Interpolator"
donberryman, do you have the dac up and running? FYI when you have the computer volume sit to max it will send a 24 bit signal to your dac. If you have a 16 bit dac it will not work. So if it works will depends on your dac.
I don't know if my DAC is 16 or 24 bits,, so I'll give it a try when I get home tonight. I assume that since I am sending a digital signal to my reciever, that that is where my DAC resides. S/PDIF is either a 20 or 24bit
looking /etc/vortexbox-player/mpd0.conf, the contents are:
# Created by VortexBox on February 10, 2010, 4:59 pm # If you edit this file it will be over written the next time you make changes in the GUI. # music_directory "/storage/music/flac" playlist_directory "/var/lib/mpd/playlists" db_file "/var/lib/mpd/database" log_file "/var/log/mpd.log" pid_file "/var/lib/mpd/pid" state_file "/var/lib/mpd/state" sticker_file "/var/lib/mpd/sticker.sql" port "6600" zeroconf_enabled "no"
I don't see any 'output section between:{ }'
What is the syntax I need for adding an 'output section'?
donberryman, in the web gui click on the second to the last icon (speaker with vortexbox icon) and let me know each name you see and the corresponding audio device. Just the stuff under the green bar!
0 [default ]: USB-Audio - USB Sound Device C-Media INC. USB Sound Device at usb-0000:00:1d.0-2, full speed 1 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfea38000 irq 16
List of audio device ports
2: : timer 3: : sequencer 4: [ 0- 0]: digital audio playback 5: [ 0] : control 6: [ 1- 2]: digital audio capture 7: [ 1- 0]: digital audio playback 8: [ 1- 0]: digital audio capture 9: [ 1- 0]: hardware dependent 10: [ 1] : control
Now I have added the new items and my conf file is
# Created by VortexBox on March 9, 2010, 6:54 pm # If you edit this file it will be over written the next time you make changes in the GUI. # music_directory "/storage/music/flac" playlist_directory "/var/lib/mpd/playlists" db_file "/var/lib/mpd/database" log_file "/var/log/mpd.log" pid_file "/var/lib/mpd/pid" state_file "/var/lib/mpd/state" sticker_file "/var/lib/mpd/sticker.sql" port "6600" zeroconf_enabled "no" samplerate_converter "Best Sinc Interpolator"
audio_output { type "alsa" name "VortexBox Player" device "hw0,0" mixer_type "software" format "*:24:*" mixer_type "software" }
0 [default ]: USB-Audio - USB Sound Device C-Media INC. USB Sound Device at usb-0000:00:1d.0-2, full speed 1 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfea38000 irq 16
This just dosen't seem to work with work with the Audio Advantage Micro USB Sound Card connected to the Vortex Box appliance. I revert to my old conf file tomorrow and live without volume control until this is resolved.
Thanks for all the help.
PS – if anyone has this working with this configuration, pleas let me know how you did it
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