audio and input latency

Im playing around with some sound bat detection and i can tell there is some latency from when buttion is pressed and an audio source switches on (or in my case i set volume from 0 to 1). Its not much but it makes it harder to stay on beat. Iknwo there is the lateny settings in the audio tab. Besides this are there any other things i could do to lower latency in keyboard and audio?

Also is there anyway to monitor this latency? So that i can see exatcly when key is registered, when audio source recieves a call to set volume to 1 and when the volume is actually set to 1?