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AAC - General / Re: QAAC: discussion, questions, feature requests, etc.
Last post by gib -
It's far too late to edit the above post, but I've finally had more time to test and I need to make a correction and add an apparent conclusion.

First, I had thought CVBR mode generated consistent results and it was only TVBR that didn't, but further testing has revealed that's not necessarily the case. In fact, I found a file for which all modes generate inconsistent, multiple-variant output.

That discovery prompted me to install iTunes (which as far as I recalled has only CVBR and ABR modes) in a VM and test it directly instead of using QAAC. Both modes showed the same inconsistent behavior with this particular file.

So, ultimately, the seemingly odd behavior I encountered just appears to be how Apple's encoder works. I still can't shake the feeling that it's a bit weird, especially considering how other encoders are totally consistent. but it is what it is.

3rd Party Plugins - (fb2k) / Re: foo_queuecontents - View and edit queue
Last post by da yuyu -
There is a new beta release available.

- fb2k v2 is now required.
- Best run in a new portable installation.
- Configuration is not v1.0 backward compatible.

What's new:
- Dark mode.

Known issues:
- 'Hide header' is no longer available in context menus.
- Issues related to enabling/disabling columns and column auto-resize.

I will review the latest posts after a short break...

Download: Queue Editor v2.0 beta

I hope you like it... thanks for your feedback!
Movie/Multichannel audio / Re: Room Correction Hardware/Software Issues, Options. Please Advise.
Last post by bennetng -
Regarding your second paragraph, I can't quite visualize your methods for preventing IS distortion problems. But I'm hoping that IF I'm ultimately unable or choose not to pursue software based room correction that Porcus's Foobar/Replay Gain solution will solve my IS distortion issues where extant in my music sources. But tutorials for dummies would be essential.
ReplayGain data is collected by scanning the source materials without taking room correction into account.

Because you are doing room correction and room correction is basically a customized EQ applied to the source. After room correction the waveform will change and ReplayGain peak values based on the source cannot precisely reflect the peak values after room correction.

If you still want to do it in the RG way you will need to store the room corrected audio data into a separate set of audio files using a lossless floating point PCM format, then perform RG scan on these floating point files to find the actual, room corrected peaks.

Hopefully you already understand the differences between sample over and intersample over. Headroom in the DAC can only mitigate intersample over, not sample over, and room correction can introduce sample over. Regarding the Gearspace thread you pointed to, the OP of the thread (Ian) in fact confused about different types of over and made a clarification:
If you are doing room correction on the fly, then you are sending the room corrected audio data to the audio driver, and even my cheapo Sound Blaster has a realtime meter to monitor the room corrected input level to the device driver. Basically, you just lower the software playback level to the device driver so that the meter peaks at several dBs below full scale and the job of preventing intersample over is done.

With your first paragraph, I've never read about much less encountered anything with ADAT connectivity and don't know how it would be applicable for equalizing my system to my room. Among other things, what I don't get is how Kal Rubinson seemed able to steer clear of all or most of the connectivity issues raised, plus without any temporary or permanent use of multiple ADC channels (beyond the one for making microphone test recordings) and yet have complete success implementing DIRAC Live 3 RC . Indeed, save for whatever mic/preamp/ADC/USB hardware he needed to run DIRAC mic test signal measurement recordings for his main speakers and subs (Revel and SVS all passively crossed I think), this Exasound e38MK2 eight-channel DAC was the only converter I read about which remained in his system, at least for MCH playback.

The only thing Kal did find was that use of DIRAC imposed nearly a 20db gain loss when he reviewed and used this DAC for room correction. To make up for that loss he resorted to the rather clunky solution of installing three of these stereo preamps.

But I still wish I could understand how Kal apparently achieved system/room eq if he did not have to contend the connectivity protocols you describe or what he did to circumvent those issues.
Synchronization is required only if you want to operate two independent devices simultaneously with one clock source. It is not required if you only use the ADC to capture a room correction profile and use the profile during playback. I just wanted to point out USB has no role on syncing two independent devices.