The volumio 3 for NanoSound is production ready but not in volumio plugin store yet.
To install, please try to run these commands by copying to linux session line by line:
sudo apt-get update
sudo apt-get install dos2unix
cd /home/volumio
rm -f nanosound_forv3.zip
rm -rf nanosound
wget https://github.com/nanomesher/Nanomesher_NanoSound/raw/master/packages/nanosound_forv3.zip
mkdir ./nanosound
miniunzip nanosound_forv3.zip -d ./nanosound
cd ./nanosound
dos2unix install.sh
volumio plugin install
Source Code
Feature branch of Nanosound plugin for volumio 3 are in, feel free to contribute!
https://github.com/nanomesher/Nanomesher_NanoSound/tree/DAC-3-features/
https://github.com/nanomesher/volumio-plugins/tree/nanosound-v3-upgrade
Ready made 3 volumio image