Hey there Federico,
We have shared different software suggestions all of which were recommended to us by sound engineers and audio producers. There are many musically-inclined community members that are already using these tools. You are most certainly not limited or required to use any of them to submit a sound logo.
Here are some of those free gratis and free libre suggestions for you on meta. Hope this helps. During the May–June community conversations, we did demonstrations of Audacity, a wonderful free and open tool for audio production. You can watch the demonstration at your convenience.
