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asoundrc

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+pcm.MAUDIO {
+	type hw
+	card rockchipes8316c
+	device 0
+	subdevice 0
+	nonblock true
+}
+
+ctl.MAUDIO {
+	type hw
+	card rockchipes8316c
+	buffer_size 10000
+	period_size 8192
+}
+
+pcm.loopin {
+	type plug
+	slave.pcm "hw:Loopback,0,0"
+}
+
+pcm.loopout {
+	type plug
+	slave.pcm "hw:Loopback,1,0"
+}
+
+pcm.multi {
+	type route;
+	slave.pcm {
+		type multi;
+		slaves.a.pcm "MAUDIO";
+		slaves.b.pcm "loopin";
+		slaves.a.channels 2;
+		slaves.b.channels 2;
+		bindings.0.slave a;
+		bindings.0.channel 0;
+		bindings.1.slave a;
+		bindings.1.channel 1;
+		bindings.2.slave b;
+		bindings.2.channel 0;
+		bindings.3.slave b;
+		bindings.3.channel 1;
+	}
+
+	ttable.0.0 1;
+	ttable.1.1 1;
+	ttable.0.2 1;
+	ttable.1.3 1;
+}
+
+pcm.pbnrec {
+	type plug
+	slave.pcm "multi"
+	hint {
+		show on
+		description "Alsa Playback & Record"
+	}
+}
+
+pcm.!default {
+	type plug
+	slave.pcm "pbnrec"
+}

audio_vis.sh

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+#!/bin/ash
+clear
+arecord -q --period-size=50 --buffer-size=150 -r 4000 --disable-softvol -f U8 -t raw -D loopout | hexdump -e '"%02o\n"' | tr -d '*' | xargs -n 50 -r ./micro-utils/bin/spark -n -r
+