MIDI setting bit rate changes using Decibel or Audirvana

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brother love
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MIDI setting bit rate changes using Decibel or Audirvana

Post by brother love » Wed Feb 08, 2012 2:31 pm

MIDI USB 24/96 DAC output setting is changing from 24 bit 96 kHz to 16 bit 96 kHz when playing digital files from Decibel audiophile player (purchased this past weekend from iTues).

I tried to enable logging & enter 2 commands per S. Booth thread instructions, but can’t get it to be recognized in Terminal (I’ve tried every permutation that I can see w/ no luck). Decibel Log does not show up in Library/logs/Decibel.log after launching (some instructions on how input into Terminal would be helpful if possible).

My system: iMac (late ’09): 3.06 GHz, 4 gb memory, 500 gb Hitachi HD w/ 460 gb available memory. 5m USB cable routed to external Grant Fidelity 24/96 USB TubDAC-11
(http://shop.grantfidelity.com/Grant-Fid ... erter.html ).

iMac System Preference sound settings: Output: Grant Fidelity USB DAC, Input: iMac internal speaker, Sound effects: internal, iMac volume set to maximum.

MIDI settings: 24 bit/ 96000 Hz

I store 24/96 digital music files in an iMac folder separate from iTunes (so I don’t clog up my wife’s ITunes mp3 files & she doesn’t have to worry about synching her tunes to iPod).

Enabled Decibel settings: obtain exclusive rights, automatically adjust sample rate, maximum quality.

When I select 24/96 tracks to Decibel & play a track, bottom of Decibel window indicates Grant Fidelity DAC acquired exclusive rights, but a MIDI window pane shows bit rate changing from 24 to 16, Sample rate remains 96000 Hz. Inspector window shows FLAC/ WAV files as 24 bit/ 96 kHz. I can manually change MIDI setting to 24 bit while song is playing (but sounds no different).

When Decibel is exited, MIDI settings revert back to 24 bit. So is Decibel playing at 16 bit/ 96 kHz or 24 bit/ 96 kHz ? Thanks for your help.
Last edited by brother love on Sun Feb 12, 2012 3:46 pm, edited 2 times in total.

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sbooth
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by sbooth » Thu Feb 09, 2012 9:32 pm

Without the log file it is difficult to know exactly what formats are in use. To use Terminal to enable logging, please enter the following commands one at a time pressing return after each one.

Code: Select all

defaults write org.sbooth.Decibel EnableLogging -bool YES

Code: Select all

defaults write org.sbooth.Decibel LogLevel -int 5

brother love
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by brother love » Thu Feb 09, 2012 10:02 pm

Sorry, I was adding a $ symbol to commands & wasn't hitting return between commands. Re-entering commands properly, launching Decibel & operating 2 different 24/96 tracks yielded the following same results in Decibel.log ...

Thu Feb 9 16:46:47 [Wifes name]-iMac.local Decibel[220] <Warning>: Ring buffer has invalid format
Thu Feb 9 16:46:47 [Wifes names]-iMac.local Decibel[220] <Warning>: CreateConvertersAndSRCBuffer failed

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sbooth
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by sbooth » Fri Feb 10, 2012 12:56 am

I'd forgotten which logging level would be best- there isn't enough information in that log to determine the format information. Can you try setting the log level to INFO like this:

Code: Select all

defaults write org.sbooth.Decibel LogLevel -int 6
that should provide quite a bit more information.

brother love
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by brother love » Fri Feb 10, 2012 11:00 am

Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Opening output for device 0x108 (Grant Fidelity dac-11)
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Setting output device UID to AppleUSBAudioEngine:Grant Fidelity dac-11 :Grant Fidelity dac-11:4300000:2,3
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Setting output device ID to 0x108
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Digital volume set to 1
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Digital volume set to 1
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Found plug-in: org.sbooth.Decibel.PlugIn.AddSelection
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Found plug-in: org.sbooth.Decibel.PlugIn.GrowlNotifier
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Found plug-in: org.sbooth.Decibel.PlugIn.IRRemote
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Found plug-in: org.sbooth.Decibel.PlugIn.iTunesBrowser
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Found plug-in: org.sbooth.Decibel.PlugIn.Scrobbler
Fri Feb 10 05:54:52 Leigh-iMac.local Decibel[219] <Info>: Instantiated plug-in: org.sbooth.Decibel.PlugIn.iTunesBrowser (DecibeliTunesBrowser)
Fri Feb 10 05:55:10 Leigh-iMac.local Decibel[219] <Info>: Creating decoder for "2L-068_stereo96_01_15.flac"
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Taking hog mode for device 0x108
Fri Feb 10 05:55:11 Leigh-Lovedays-iMac.local Decibel[219] <Info>: Selecting physical format for stream 0x10a: 2 ch, 96000 Hz, 'lpcm' (0x0000004c) 24-bit little-endian signed integer
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Setting stream 0x10a physical format to: 2 ch, 96000 Hz, 'lpcm' (0x0000004c) 24-bit little-endian signed integer
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: -> kAudioStreamPropertyPhysicalFormat [0x10a]: 2 ch, 96000 Hz, 'lpcm' (0x0000004c) 24-bit little-endian signed integer
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: -> kAudioStreamPropertyVirtualFormat [0x10a]: 2 ch, 96000 Hz, 'lpcm' (0x0000004c) 24-bit little-endian signed integer
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Warning>: Ring buffer has invalid format
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Warning>: CreateConvertersAndSRCBuffer failed
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Starting playback for "2L-068_stereo96_01_15.flac"
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Enqueuing "2L-068_stereo96_01_15.flac"
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Device preferred stereo channels: 1 2
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Stream 0x10a information:
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Virtual format: 2 ch, 96000 Hz, 'lpcm' (0x0000004c) 24-bit little-endian signed integer
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Starting channel: 1
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Channel map:
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: 0 -> 0
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: 1 -> 1
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Decoding starting for "2L-068_stereo96_01_15.flac"
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Decoder format: 2 ch, 96000 Hz, 'lpcm' (0x0000002c) 24-bit little-endian signed integer, deinterleaved
Fri Feb 10 05:55:11 Leigh-iMac.local Decibel[219] <Info>: Decoder channel layout: kAudioChannelLayoutTag_Stereo (0x00650002)
Fri Feb 10 05:55:12 Leigh-iMac.local Decibel[219] <Info>: Creating decoder for "2L-071_stereo96_01_01.flac"
Fri Feb 10 05:55:12 Leigh-iMac.local Decibel[219] <Info>: -> kAudioDevicePropertyDeviceIsRunning [0x108]: True

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sbooth
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by sbooth » Fri Feb 10, 2012 5:11 pm

From the looks of that log the music is being sent to the DAC as stereo 96 KHz 24-bit integers, which is probably as it should be!

brother love
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Re: Decibel changing MIDI setting bit rate, but not sample r

Post by brother love » Fri Feb 10, 2012 5:38 pm

sbooth wrote:From the looks of that log the music is being sent to the DAC as stereo 96 KHz 24-bit integers, which is probably as it should be!
Excellent! I was hoping this was the case. It sounds really good to me, but I wanted to be sure that I was unleashing the full potential. :wink:

Isn't it odd though that the iMac MIDI setting always reverts to 16 bit when playing a 24 bit track thru Decibel; then after Decibel is closed, MIDI setting immediately resets to 24 bit ? :shock:

brother love
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MIDI setting bit rate changes using Decibel or Audirvana

Post by brother love » Sun Feb 12, 2012 3:39 pm

As a follow-up to issues this week w/ MIDI setting bit rate changing from 24 bit to 16 bit when using Decibel ...

I tried a trial version of Audirvana Plus this weekend, & using the same external DAC & settings (exclusive access rights, etc.) as Decibel, the MIDI settings changed from 24 bit/96 kHz to 16 bit/96 kHz when using Audirvana Plus. Same Hi-Rez files were played & indicated 24/96. when audio player was closed, MIDI setting reverted back to 24 bit.

As such, I have revised my thread title to reflect these additional findings.

I tried all (4) USB ports of iMac ... same results. I moved iMac to Audio system & utilized 1 meter USB cable vs. 5 meter USB cable used originally ... same results.

I think I can safely say now that there is some quirky issue w/ iMac MIDI Audio! :wink:

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