Hi, I've been looking for a solution to this problem for a long time, and this article finally showed me the way to do it.
https://fitzcarraldoblog.wordpress.com/2016/09/29/another-look-at-beeps-in-linux/
diff .config .config.old
--- .config
+++ .config.old
@@ -3407,6 +3407,7 @@
# CONFIG_SND_SOC is not set
# CONFIG_SOUND_PRIME is not set
CONFIG_AC97_BUS=m
+CONFIG_SND_PCSP=m
Compiling the kernel with those options creates the control slider for the beep in alsamixer!