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#1 2019-04-22 15:24:30

eDio
Member
From: Ukraine, Kyiv
Registered: 2008-12-02
Posts: 413

[SOLVED] Frequency autoswitching with pulseaudio and E-MU 0404 USB

Hello,
I'm having trouble with sampling frequency autoswitching when using E-MU 04040 USB soundcard with pulseaudio.

I likely wouldn't bother asking, but this case is rather strange.

I have 2 E-MU 0404 USB soundcards, and autoswitching works with one but not with the other

Here's dmesg output when I connect both:

[  842.304339] usb 1-1.2: new high-speed USB device number 6 using dwc2
[  842.446437] usb 1-1.2: New USB device found, idVendor=041e, idProduct=3f04, bcdDevice= 1.00
[  842.466211] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  842.479357] usb 1-1.2: Product: E-MU 0404 | USB
[  842.489520] usb 1-1.2: Manufacturer: E-MU Systems, Inc.
[  842.500246] usb 1-1.2: SerialNumber: E-MU-09-3F04-07D90916-0914D-8761T2A
...
[  901.444396] usb 1-1.2: new high-speed USB device number 7 using dwc2
[  901.586367] usb 1-1.2: New USB device found, idVendor=041e, idProduct=3f04, bcdDevice= 1.00
[  901.603744] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  901.616060] usb 1-1.2: Product: E-MU 0404 | USB
[  901.625459] usb 1-1.2: Manufacturer: E-MU Systems, Inc.
[  901.635506] usb 1-1.2: SerialNumber: E-MU-43-3F04-07D70109-0964D-STATION 01

From this both seem to be the same: vendor and product IDs are the same. Yet somehow, sampling frequency autoswitching via PulseAudio works with one of them, but not with the other.
And at the same time sampling frequency autoswitching _via alsa_ works with both.

Would appreciate any hints and suggestions.

Thanks

Last edited by eDio (2019-04-22 22:48:55)

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#2 2019-04-22 22:43:36

eDio
Member
From: Ukraine, Kyiv
Registered: 2008-12-02
Posts: 413

Re: [SOLVED] Frequency autoswitching with pulseaudio and E-MU 0404 USB

This quirk gave me an idea

https://github.com/taravasya/taravasya_ … 8bdb7c2bd5

To make frequency autoswitching working I had to switch PulseAudio profile to "Analog Stereo Output" (instead of Duplex). And now both cards work as expected!
https://imgur.com/Xu4GKdy

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