default or selected kernelversion does not have config value CONFIG_SND_SGALAXY.
Result is shown for kernelversion 5.4.229

Aztech Sound Galaxy

modulename: snd-sgalaxy.ko

configname: CONFIG_SND_SGALAXY

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ISA sound devices
└─>Aztech Sound Galaxy
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Say Y here to include support for Aztech Sound Galaxy
soundcards.

To compile this driver as a module, choose M here: the module
will be called snd-sgalaxy.

source code: