[pulseaudio-discuss] Frequency autoswitching with E-MU 0404 USB

[edio]

Hello,
I'm having trouble with sampling frequency autoswitching when using E-MU 
0404 USB soundcard.

This case is rather strange.

I have 2 E-MU 0404 USB soundcards: regular one (model EM8761) and white 
edition (model EM8762).

Autoswitching in PulseAudio works with the regular one but not with the 
white edition. However in ALSA both sound cards work as expected.

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, PulseAudio works differently for them. Is there maybe 
some sound card specific code in PulseAudio?

Would appreciate any hints and suggestions on how to debug the issue.

Thanks