[Harp-L] re: Volume pedal

[Captron100@xxxxxxx]

In a message dated 10/10/2005 1:03:51 PM Eastern Standard Time,  
harp-l-request@xxxxxxxxxx writes:

I use an  active Goodrich volume pedal.  (Active pedals are less likely to 
rob your  tone than passive pedals are).  Goodrich pedals are preferred among  
discerning steelers.
 

Can someone please explain the difference bet. active and passive.  I  wish i 
had a way to remember; i can never remember which is which.
ron