Rick HNJAMeindersma

X32/M32 with X-USB on Linux/Ubuntu

This guide is written for all owners of a Behringer X32 or Midas M32 with a X-USB 32x32 channel expansion card. It is directed towards splitting the X-USB channels up in virtual outputs on Ubuntu 18.04 with PulseAudio. The guide may also work for other versions or distro's of Linux with PulseAudio.

It is assumed that the X-USB is installed and connected to a computer. And automatically recognized as a multi-channel soundcard by the operating system. Also note that on Ubuntu 18.04, PulseAudio runs on top of ALSA. ALSA picks up the soundcard and PulseAudio then uses the full soundcard through ALSA to create virtual channels.

Table of contents

Find X-USB device name
Create virtual outputs in PulseAudio
Restart PulseAudio
Control application channel

This is a very, very dirty way of turning ChangeDetection.io's price-mode output, which is JSON, into a more friendly markdown format. Using Jinja2, which is currently lacking a from_json function, we replace parts of the JSON output to form a markdown message. This will only work correctly as long as ChangeDetection.io's price-mode override JSON format stays EXACTLY the same. Any non HTTP 200 response might trigger such a change in which case a malformed message might be produced and send. Not something that could (should) "break" your ChangeDetection.io or notification service. Which is Gotify in this example gist. Tested with Tweakers.net Pricewatch product pages.

Example output

Some Product has changed!

Lowest: 235.67 → 235.65
Highest: 482.57
Sellers: 33
Currency: EUR

https://tracking-and-comparing-web.site/some-product.html

	#!/bin/sh
	# A simple Debian/Ubuntu script which will check for updates and act accordingly
	# Version 1.2
	# Source: https://superuser.com/questions/199869/check-number-of-pending-security-updates-in-ubuntu

	# Status levels
	STATUS_OK=0
	STATUS_WARNING=1
	STATUS_CRITICAL=2
	STATUS_UNKNOWN=3

	#!/bin/sh

	# Install TVheadend
	curl -1sLf 'https://dl.cloudsmith.io/public/tvheadend/tvheadend/setup.deb.sh' \| sudo -E bash
	sudo apt update && sudo apt install -y tvheadend

	# Install ffmpeg piper
	sudo apt install -y curl ffmpeg
	sudo mkdir /etc/tvheadend && sudo chmod a=rwx /etc/tvheadend
	echo "#!/bin/sh

	from http.server import BaseHTTPRequestHandler, HTTPServer
	import re
	import subprocess
	import json

	# Function: add value to dictionary
	def nested_set(dic, keys, value):
	for key in keys[:-1]:
	dic = dic.setdefault(key, {})
	dic[keys[-1]] = value

	#!/usr/bin/env python2

	# Import required libraries
	import datetime
	import collections
	import re
	import sys
	import serial
	import crcmod.predefined
	import json

	#!/bin/bash

	# Install frontail
	sudo apt install -y nodejs npm &&
	sudo npm install frontail -g &&
	echo "[Unit]
	Description=Frontail openHAB instance
	Documentation=https://github.com/mthenw/frontail
	After=openhab.service
	PartOf=openhab.service