alsa-project/alsa-lib issue #251 was edited from tramchamploo: ``` pcm.er4s { # Direct hardware access type hw # Loopback card name # # Has to match "id" in the options of the snd-aloop module card "Loopback" # Loopback device ID device 0 # Number of audio channels # # Has to match the number of channels in music player app # and in the CamillaDSP input configuration channels 2 # Format of audio stream # # Has to match the format defined in the # of the CamillaDSP input configuration format "FLOAT_LE" # Sampling-rate of audio stream # # Has to match the sampling-rate defined in the # CamillaDSP configuration rate 48000 } ctl.er4s { type hw card "Loopback" } ``` This is the .asoundrc I'm using, it worked before this update. Now aplay -L doesn't show this device. Using mpd to play to the Loopback gets `snd_pcm_hw_params() failed: Invalid argument`. Btw, alsa should really have a detailed specification on asoundrc file. The value of the format option I specify is from a dsp project, otherwise I have no idea what to write here. And according to [https://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8](snd_pcm_format_t) it's in a totally different format. Issue URL : https://github.com/alsa-project/alsa-lib/issues/251 Repository URL: https://github.com/alsa-project/alsa-lib