Brian,You can mix and match.The Roland Hardware is great and complete.Latency,has two meanings,the first,the time delay[audio card],signal from a midi controller to the audio[wave],via the sound card[direct drivers virtually make this acceptable]. This is only a problem when you mix a realtime part with a recorded part[audio].The second example,Latency is that period of time when a expected advent is late[And your wife is very miserable][baby makes3?],