When Things Go Wrong
Design, Development & Manufacture, Maintenance / Repair / Modification
(SOS Nov 91)
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Adding an Independent Tracking Output to the 4780 Sequencer | |
Article from Polyphony, October 1976 | |

I have added an extra stage to the sequencer which allows two VCO's to be used with a constant pitch offset on one of the VCO's. This is similar to using a 4781 Transposer on the output of the sequencer, except with this modification individual glide times can be set for each oscillator. This can be used to cause the oscillators to detune when changing from note to note, and after a short time they will resolve to the properly tuned interval.
The circuitry is actually a duplication of the original output stage of the sequencer. I don't believe that several of these output stages would overload the sequencer. I mounted my extra circuitry behind the blank panel of the 4700/A Sequencer Pac. The blank panel can be used to mount the glide and transpose controls and the output jack.
When Things Go Wrong |
Balancing Acts - Cable Wiring Tips (Part 1) |
A Digitally Addressed Transposer - for Your Analog Keyboard or Sequencer |
Amdek Hand Clapper Kit |
VCO |
Lab Notes: In Pursuit of the Wild QuASH |
The Syndrom - How it Works (Part 1) |
The Layman's Guide to Digital Logic Gates - (in one easy lesson) |
Digital Signal Processing (Part 1) |
Technically Speaking |
Care & Repair - Tape Machine Line-Up |
Care & Feeding of the Synthesizer |
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Feature by Brad Bennett
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