Feedback tuning,pitch,stability parameters

[markphaser]

How do i adjust the Stability of a Fuzz unit? does adjust the feeback or bias change the stability?
What other way is there to affect the Stability of a fuzz unit please?

How do i adjust the feedbacks pitch and tone?

How do i "Tune" the Feedback?

[Primus]

You can turn down the stability of a fuzz by reducing the voltage. You can do this from your power supply like on a pedal power or with a pot.