Actually our drummer hummed the whole time he tracked drums for our last album...  it was hysterical to solo the overheads and listen to him.
		
		
	 
Electronic drums, midi triggers, playing samples of the drummer's acoustic kit.  Only way to go.  No farts, and you can edit the track afterwards if you really need to.
	
	
		
		
			John... that variac looks like a beast 
		 
		
	 
Variacs are worth the money, its the best solution because you're varying the voltage to the lights, not the pulse shape.
An autotransformer is essentially the same thing, except the input voltage can vary from 70-150V, and the output is dead nuts 120V, another really good idea for a studio.
The autotransformer also isolates your studio power feeds from the rest of the mains... if its a good one, you CAN use cheap, k-mart quality light dimmers with no issues, as long as the dimmers are on a different circuit.
Consider an autotransformer as a 500lb choke 

  Mount on a steel pad, suspended by hockey pucks, and you'll be quite happy.  Ground the base of course, and make sure the transformer has breathing room.  Oil filled transformers can get warm, and explode when unhappy.