Because analog synth components like oscillators can drift in pitch over time, or due to temperature changes etc, we have a created a tuning guide to show the tuning procedure. Please note this operation should only be undertaken by either a trained technician or someone with relevant technical ability, as any damage caused during this procedure would not be covered by warranty. If you are unsure then please don't hesitate to contact us for assistance: http://www.musicgroup.com/support/be...