Piano roll editing

Hello guys,
 My question is relating to piano roll view editing. Lets say I have drums mapped out using piano roll view. At the bottom you will notice the vertical velocity lines. This is where you can change velocity for the drums as you see fit. However, there are times where you have snare, high hat, and kick drum all on one line at the same time. If I want to work on just the snares for example, Its really difficult to do so because of all the over lapping thats taking place. I know I can click on the node and do adjustments that way, But is there a way to just have the snares show when making adjustments? Then when im ready to work on say....kick drum I can single those out? ect.... I lwould love to work that way because it would give me a visual representation of whats happening. Anyone know what im talking about???