The Wolf Terminator for double bass, WTB-2 is pretuned to G#2. The Wolf Terminator for cello, WTC-3 is pretuned to F3. If you would like to have your Wolf Terminator pre-tuned (at no charge) to the frequency of your wolf note, let us know the frequency of the wolf note and we will take care of the initial tuning. You can use descriptions such as: exactly on F*, slightly above F*, on both F* and F#*, etc. (*substitute the note on your instrument). If your instrument tuner displays your wolf note frequency (in hz), please include it along with the note description. ***PLEASE NOTE: The pre-tuning option applies only to the WTC-3 Wolf Terminator for cello, and the WTB-2 Wolf Terminator for bass. The DST-2 Dead Spot Terminator for electric bass cannot be pre-tuned because tuning can only be done after the unit is first installed on the instrument.***