Hello!
Thank you very much for your help, I was able to create a custom Torizon OS image by following the guide from this link:
Build Torizon OS from Source With Yocto Project/OpenEmbedded
What I did to enable the CONFIG_SND_SEQUENCER module was to follow the guide:
Custom Meta Layers, Recipes and Images in Yocto Project (hello-world Examples)
but taking into account the configuration fragments in Yocto from the post:
Modify the linux kernel with configuration fragments in Yocto
as suggested in the forum:
Kernel Configuration using Config
The Torizon OS image worked correctly with the sequencer module enabled by default, loading the tar image with a USB and first entering recovery mode as explained in the link:
Loading Toradex Easy Installer
Then I customized the image following the guide:
Everything worked properly and now I can develop my application using the tools provided by the Torizon IDE VS Code extension.
Thank you very much!