Apparently "-soundhw pcspk" is deprecated too. However, I don't know which "name" to insert, and I can't test it, hence I didn't touch it.
@@ -42,7 +42,7 @@ $SERENITY_EXTRA_QEMU_ARGS
-usb
-debugcon stdio
-soundhw pcspk
--soundhw sb16
+-device sb16
"
[ -z "$SERENITY_COMMON_QEMU_Q35_ARGS" ] && SERENITY_COMMON_QEMU_Q35_ARGS="
@@ -59,7 +59,7 @@ $SERENITY_EXTRA_QEMU_ARGS
export SDL_VIDEO_X11_DGAMOUSE=0