I have an asound.conf file that defines aliases to hardware card.

pcm.test {
type hw
card 0
device 0
subdevice 0
}

I want to be able to dynamically change this config file while application is feeding audio data to test. That is change it to something like this:

pcm.test {
type hw
card 0
device 0
subdevice 1
}

This change does not take effect till I restart the application. Is there a way to dynamically make this alias switch without restarting the application? Can I use any other ALSA plugin for this? Appreciate any suggestions.

You *might* be able to do it with a combination of configuration files and command line to switch from one card to another.
Read http://alsa.opensrc.org/MultipleCard...sound_cards:_2

Start at "Multiple Sound Cards -- Example on Debian GNU/Linux" and read through to "Example commands and options for selecting sound cards".

The link referenced above doesn't state that you can switch while and application is running. It just tells how to switch from one card to another.

Trying in on the fly is up to you.

Good luck.