Hi Eric,
Thanks for your kind words, really appreciate it, this is exactly why I made this program!
Happy to discuss improvements with you since you have such a long-lasting experience, reach out to me via e-mail (alex.vandenabeele[at]gmail.com) and maybe we can find a moment to chat.
The sounds can indeed be customized, but I have to admit it's not very well documented, you can find out how in this devlog.
Thanks!
Alex