Scripts are needed to change audio configuration.

html/scripts/get_audio_info.sh

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+aplay -l | grep "card 0" -m 1
+amixer -c0 scontrols | grep "Simple" -m 1
+aplay -l | grep "card 1" -m 1
+amixer -c1 scontrols | grep "Simple" -m 1
+

html/scripts/set_audio.sh

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+#!/bin/bash
+
+# Files to modify
+
+BOOTCONFIG=/boot/config.txt
+MPDCONFIG=/etc/mpd.conf
+CARDPRIORYTY=/lib/modprobe.d/aliases.conf
+
+INTERNALFIRST=/usr/share/radio/hardware/audio/internal.conf
+USBFIRST=/usr/share/radio/hardware/audio/usb.conf
+
+# Only if 3 params
+if [ $# = 3 ]; then
+	# Get parameters from commandline
+	
+	# "internal or "usb"
+	CARD=$1
+	# Mixer name for volume control
+	MIXER=$2
+	# PWM mode 1 - standard , 2 - high quality
+	PWM=$3
+
+	# Set prioryty of audio device
+	if [ ${CARD} = "internal" ]; then
+		cp ${INTERNALFIRST} ${CARDPRIORYTY}
+	elif [ ${CARD} = "usb" ]; then
+		cp ${USBFIRST} ${CARDPRIORYTY}
+	fi
+
+	# Set PWM mode
+	sed -i "s/audio_pwm_mode.*/audio_pwm_mode=${PWM}/" ${BOOTCONFIG}
+
+	# Set mixer name
+	sed -i "s/^[ \t]*mixer_control.*/\tmixer_control\t\"${MIXER}\"/" ${MPDCONFIG}
+	
+	reboot
+fi