Future Retro 777 Tuning Procedure - Manual (Page 2)

Locate the four yellow trim pots on the left-hand side of the analog board (next to the
oscillator frequency controls). These trimmers are labeled R1, R2, R5, and R6. These are
the trimmers you will be adjusting.
Create a simple two note sequence containing the notes C1 and C2. Note: you may want
to slow the sequencer’s tempo down while performing the tuning procedure.
Start with tuning oscillator A. You will need to turn oscillator A’s volume control up. As
the sequence now plays C1 and C2 adjust trimmer R5 for a 2:1 scaling of frequency.
Once this is done, change the sequence to play C2 and C3. Continue to adjust R5 for a
4:1 scaling of frequency. Change the sequence once again to play C2 and C4. Continue to
adjust R5 for a 8:1 scaling of frequency. Change the sequence once more to play C2 and
C5, and adjust R5 for a 16:1 scaling of frequency. And finally,change the sequence once
to play C2 and C6, and adjust R5 for a 32:1 scaling of frequency. Once this is done the
scaling has been set for oscillator A. You can now play a single tone in the sequencer and
adjust R6 until the oscillator produces the correct pitch for the note the sequencer is set to
play. But make sure the oscillator Frequency controls are set to their absolute mid
position.
You can use this same procedure to tune oscillator B. Make sure to turn down oscillator
A’s volume and turn oscillator B’s volume up so you can monitor the sound as you tune.
While tuning oscillator B you will use trimmer R1 to set the oscillator scaling, and R2 to
set the initial frequency of the oscillator.
Once this is done you can reinstall the unit’s front panel on the unit, along with the
screws, nuts, and knobs.
If you have any questions about the tuning procedure, please feel free to contact us for
further assistance.