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USB Audio Recorder PRO (UAPP): 24- and 32-bit playback, ubiquitous USB audio support for Android

Discussion in 'Portable Source Gear' started by nztechfreak, Feb 5, 2014.
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  1. Davy Wentzler
    Sounds correct since there is only MQA decoding, not rendering.
  2. chupa
    so it is not possible to play full MQA files?
  3. Davy Wentzler
    You are playing MQA files and they get decoded (the most important step). There cannot be generic software that features a MQA renderer since it differs for every hardware, so the rendering stage is not present in UAPP.
  4. fokta
    Davy, somehow it fixed itself, I just let it connect to Wifi..

    Anyway, I don't know how and why, if it fixed, I will not ask more question

    TQ, I am happy man again
  5. Percival
    Is there any hope of getting UAPP to play these streams? It seems a shame not to be able to play BBC radio in the highest quality.
  6. Davy Wentzler
    Well, not any time soon due to other priorities and the complexity of this problem (I don't control the server, so I cannot debug what is being sent and why it only sends one chunk).
  7. Percival
    Fair enough. Is there something I can do? Is there some way I can check to see why Firefox can play it on Android (presumably receiving more than one chunk!)?
  8. 1000ROUNDZ

    I just got the Hiby R5 and it's quite incredible the pairing with UAPP. However, I randomly get clicking sounds on songs and it's not the song itself, it's just random. I skip and play something else and then come back to the song and it's fine.
    Are there settings I should adjust for the R5 specifically, or is it a known issue to be corrected?

  9. Davy Wentzler
    Perhaps you can experiment with the buffer size in the Internal HiRes Audio section.
  10. Davy Wentzler
    I'm afraid not.
  11. 1000ROUNDZ
    I just tried but it doesn't solve it. However, I noticed that it only happens with MQA tracks. Every now and then I need to switch to a non-MQA track or two, and then go back for the playback to go without the clicking sound.
    Any idea?
  12. wht
    @Davy, with regards to Hardware Volume Control, if available,

    (1) under what circumstances and why should it be used?

    (2) to ensure bit perfect through the chain, should it be set to maximum?

  13. stemplar
  14. Davy Wentzler
    1) Always if your DAC features such a control and doesn't have a physical volume control
    2) Now that's the topic of the week. Since 5.2.8, UAPP lowers the hardware volume to -15dB (or actually internal volume control) when it finds it and has not been set before. The app cannot know whether the device has a physical volume control and actually, there shouldn't be an internal one if there is an external one. However,some DACs, like the Pro-ject Prebox, Sony PHA's and I suspect Topping's, have an internal volume control that does volume control on the digital audio stream instead of the analogue output. Changing the internal hardware volume then kills bit-perfect and MQA decoders stop decoding MQA and DSD tracks sound like noise. So, to answer your question: it shouldn't be set to maximum unless your DAC has a physical volume control and its internal volume control (if present) controls digital volume.

    In the course of the next weeks and months, I will add USB vendor/product ID's to the app, to exclude these devices from getting the -15dB treatment.
    Chris Kaoss likes this.
  15. Davy Wentzler
    UAPP's MQA decoder is as real as it gets..
    stemplar and WitzyZed like this.
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