Maybe try adding rate 48000 to the USB section of /etc/asound.conf

> 
> Yes I tried rdalsaconfig under root. Only my main card the M-audio shows,
> but not the USB mic.
> I'm thinking as this is not a "full" card only a recording device it
> probably requires a manual add.... And I know ALSA sees the USB mic as
> running arecord -l shows it as an available recording device.
> 
> Andrew
> 
> On Wed, Jul 29, 2020, 21:39 David Klann <dxkl...@pm.me> wrote:
> 
> > Hey Andrew,
> >
> > On 7/29/20 7:16 PM, you wrote about a new sound card:
> > >
> > > I have an USB Microphone I'd like to use. How do I add a second sound
> > input?
> > >
> > > UNder RDAdmin--> Audio resources. I only see my M-Audio Delta410 listed
> > > as card0, but no USB Mic on Card 1
> > >
> >
> > Have you run RDAlsaConfig as root? If you installed Rivendell the
> > "usual" way on CentOS/Red Hat/etc. it's on the Applications menu under
> > Rivendell -> Configuration -> RDAlsaConfig
> >
> > This utility enables you to assign ALSA devices to be used with
> > Rivendell. See the Wiki article at
> >
> > http://wiki.rivendellaudio.org/index.php/Configuring_Rivendell_to_work_with_ALSA
> > for more details.
> >
> > Hope this helps!
> >
> >    ~David Klann
> >
> >
> > > Running arecord -l I see the USB Microphone listed:
> > >
> > > **** List of CAPTURE Hardware Devices ****
> > > card 0: M410 [M Audio Delta 410], device 0: ICE1712 multi [ICE1712 multi]
> > >     Subdevices: 0/1
> > >     Subdevice #0: subdevice #0
> > > card 1: Microphone [USB2.0 Microphone], device 0: USB Audio [USB Audio]
> > >     Subdevices: 1/1
> > >     Subdevice #0: subdevice #0
> > >
> > > I presume I have to add this /etc/asound.conf ? So I added rd1.
> > >
> > > My current one looks like this:-
> > >
> > > pcm.rd0 {
> > >     type hw
> > >     card M410
> > >     device 0
> > >     rate 48000
> > > }
> > > ctl.rd0 {
> > >     type hw
> > >     card M410
> > > }
> > >
> > > pcm.rd1 {
> > >     type hw
> > >     card USB
> > >     device 1
> > > }
> > > ctl.rd1 {
> > >     type hw
> > >     card USB
> > > }
> > >
> > >
> > > After a reboot Card1 is not showing in audio resources. What else am I
> > > missing?
> > >
> > >
> >
> >
> ><hr>_______________________________________________
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