Black Ice - battery free onboard overdrive (BI0616) Black Ice is a battery free onboard overdrive that turns your guitar or bass tone control into an overdrive control. There are 4 wiring options available:
Polite: A little grit for single-coils; mild distortion for humbuckers and P-90s.
Warm: Mild distortion for single-coils; a little more for humbuckers and P-90s.
Hot: Medium distortion for single-coils; aggressively raw for humbuckers and P-90s subtle growl for basses.
Industrial Strength: Nasty with hotter pickups; slightly more growl for basses. The best wiring option for weak pickups.
Note: Use a 250K pot as your Black Ice control. The instructions also include diagrams for wiring your Black Ice in a stomp box, and for using a push-pull pot to switch between the Black Ice and your tone control. $19.95