Identify which microphone is on which audio card using arecord

Question

I'm using a Raspberry PI and on it I plugged two same USB microphones. I would like to be able to identify which USB microphone is on which audio card when I list devices with arecord:

arecord --list-devices **** List of CAPTURE Hardware Devices **** card 0: iTalk02_1 [iTalk-02], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: iTalk02 [iTalk-02], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0

I thought about using usb serial number but these devices doesn't provide any (or I don't know how to use well lsusb -v). But how to match results from lsusb -v command with arecord --list-devices?

I need either an identifier of the microphone or the number of the USB port.

OS information:

Distributor ID: Raspbian Description: Raspbian GNU/Linux 9.9 (stretch) Release: 9.9 Codename: stretch

Your help is much appreciated.

Thanks, Dylan

Hi @Dylan Delaporte, I have two USB sound cards. I did the following: (1) Plug in #1 and arecord --list--, lsusb, (2) Plug in one more sound card, and did the same, (3) Note the IDs of the two sound cards. Does this help? For now, no speaker or microphone is plugged. I can add two speakers and two mikes to see what happens, if you like. — tlfong01
– tlfong01, Commented Nov 6, 2019 at 5:25
Ref 1 in my answer might also be helpful: "How to setup persistent device names on Raspberry Pi - Rolf Blijleven" rolfblijleven.blogspot.com/2015/02/…. — tlfong01
– tlfong01, Commented Nov 6, 2019 at 8:49

tlfong01 · Accepted Answer · 2019-11-07 02:14:15Z

Question

How to identify which microphone on which USB sound card?

Answer

update 2019nov06hkt1558

Finding the IDs of multiple USB sound cards, with microphones. Also see Ref 1 on How to setup persistent device names on Rpi.

I have two USB sound cards. This is how I identify them:

(1) Plug in one sound card - #1 and (a) $ arecord --list--, (b) $ lsusb,

(2) Plug in one more sound card - #2 and repeat Step (1),

(3) Note the IDs of #1 and #2 USB sound cards.