QuImUfu
commented
6 years ago alsa is hard to set up but it can be set up to offer an loopback device. That is an virtual audio device that has a input and output interfaces. It can be configured so that everything played over the input interface of said device is send out to the output interface and to your soundcard. This can be used to record sounds played and has less issues than the pulseaudio monitors with some wired applications. https://bbs.archlinux.org/viewtopic.php?pid=1153194#p1153194 contains instructions that seem to work for some people.
I am using simple screen recorder on Ubuntu 16.04 to record a video playing on google-chrome. The only way I have been able to record the sound stream is to select one of the monitor channels under pulse audio. Being an audio fanatic I like to not use pulse audio if possible. If I disable pulse audio and select ALSA and the device I am using under ALSA for audio output I get no sound in the recording. Am I doing something stupid or is this an expected behaviour since there is not ALSA device that says monitor.