While Linux doesn’t have a piece of software that rivals the usability of Pro Tools, you can still do high-quality audio recording with Ardour DAW, a professional digital audio workstation. written for linux/osx. Also, you can use your linux machine as a virtual synthesiser by using VST instruments and recording directly into Ardour DAW.
Currently, Ardour DAW doesn’t support 64-bit operating systems with Windows VST support, so you will need a 32-bit OS.
Download an x86 (32-bit) version of Ubuntu Linux and install it.
Follow the guide to Ubuntu audio installation/configuration.
Then download Ardour DAW source code and follow the instructions on how to build it with Windows VST support.
The following are some screenshots and images of my own setup.
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i use this software