[SOLVED] Change the volume on USB out on RPi running on Max2Play and LMS

Hi,
It took me a long search to change the volume on the USB output towards my DAC. The default value was very low in volume compared to the other sources of my DAC. To help others in this change, here is what I’m running and how it was changed.
This is a non expert description, enough experts around here to comment and tweak.

System:
Max2Play; Squeezebox Server; Squeezelight Audioplayer; external DAC on USB

Settings in the M2P web access:
– under Raspberry Settings – detected Raspberry PI 2 – select soundcard [USB Soundcards (Northstar Essentio, Hiface and others) – Disable Build in Audio – [Save]
– under Audioplayer – Mediaplayer Squeezelite & Airplay – Edit Advanced Options [find a working one]

The working one might have a low volume, turn the external volume up to have some sound.

Get the complete system running. In my setup every usb output of the RPi starts sending output to the DAC. When you discover a low volume output next receipt might help.
>> no guaranties
>> put the external volume low 😉

Start a terminal that is connected to the Rpi at the network adress:

name: pi password: raspberry

Search for the number from your card by giving a aplay command
$ aplay -l („l“ is a small L)

for mine it was 1 (one) as it is in the next commandline
$ amixer -c 1 set PCM 100%

And finally the volume was on 100%

??? Is this a one time change that stays after a fresh startup???
It seams that a command like 100% may be also given like 0dB.

When you want to start experiencing with up-sampling you need a lower volume to prevent clipping of the signal at steep sound increases. Reduce the volume then to 95% or -3dB.

To the M2P people: great product.
Would be nice to have some basic volume setting in the audioplayer setup, I did not find it in version 2.44

Nice to have an answer if the volume command is now in the defaults or how that can be done.

Edwin