Future Retro 777 Modifications - Manual (Page 2)

Extending the range that accent will affect the filter’s cutoff frequency
Filter accent amount
You can change R130 (100K) anywhere from a 100K to 10K resistor to adjust the
amount of affect accent will have on the filter’s cutoff frequency. The less resistance used
the higher the cutoff frequency for accented notes will be. This will allow for more of the
"wow" and "whap" sound when high levels of resonance are used.
Increasing the noise source’s level
Bring the noise
You can increase the maximum level of noise that goes to the filter’s input by replacing
resistor R102 (15K) with a 4.7K or 10K resistor. Less resistance equals more noise, and
with low values of resistance you may overdrive the input of the filter.
Bypassing notes with glides
Glide time zero
Desolder R186 (100K) resistor’s lead that DOES NOT go to the base of transistor Q41
and use a switch to select whether R186’s lead goes to its original connection or ground.
When the switch is in the ground position notes programmed with a glide will not glide
but will sustain at their programmed pitch for the entire duration a note. Usually notes
last for 50% duration of a step. By mixing glided notes (100% duration) and normal notes
(50% duration) you can add a completely new feel to your sequences.
Adding a CV in to control both oscillators independently from an external CV
source
Secondary CV in for OSC B
For this mod we will let the original CV IN be the control for oscillator A and the
secondary CV IN to control oscillator B. First locate the trace on the top side of the
circuit board that runs from S1 (OSC B’s internal/external switch) to S2 (OSC A’s
internal/external switch). The trace will be just to the right of the two trim pots located
between these CV switches. You will need to cut this trace and wire it to the tip of the
jack you will use for the secondary CV input. Next, connect the sleeve of the jack to
ground. You should also run a diode (IN4148 type) from the secondary CV IN to +6v and
another to ground. This will help protect the circuit from high positive voltages or
negative voltages.
For mounting the jack, you may be able to place a 1/4" jack (depending on its body size)
just to the left of the original CV input on the back panel. If you use 1/8" jacks you could
mount it to the left of the original CV input or between the jacks on the back panel.