Block mining sound is placed under the "Friendly Creatures" sound setting

The sound for mining blocks is placed under the "Friendly Creatures" sound setting, so therefore, when you turn this sound setting off, you can't hear the sound played whilst mining the block, but you can hear the block when it is destroyed. Likewise, turning the "Block" sound setting off stops you from hearing the block being destroyed, but not the block breaking sound. (Sorry if this is hard to understand, it's a bit hard to explain).