Let's Go Shopping
ED107 - PolyDAC(X) MIDI-CV
Let's Go Shopping

The PolyDAC was a 4-channel MIDI-CV Converter originally designed by Paul Maddox and later released as open source.

The current ED107 firmware uses a 'Regular Cyclic' Mode for MIDI Note assignment. Incoming MIDI notes are assigned to the next free voice (even if it is the same note played repeatedly). So, each time you play a note it will step through and assign channels '1' then '2' then '3' then '4' then back to '1' again as you play. If you hold a note, new notes will be assigned to the next voice in that order the that they are free. If all voices are already assigned to held notes and 'POLY' is set to 'STEAL', then the next note will use the lowest voice held.

 

NB: The ED107 is supplied with 2 power cables:-

  1. A standard 16pin-16pin cable. Using this cable will connect the VOICE 1 note and gate signals to the CV/GATE Buss on the busboards
  2. A modified 10pin-16pin cable. Use this cable if you are using the systems CV/GATE Buss for any other function other than the original for CV-GATE control or if you have an alternate module that is providing master CV/GATE control signals.

 

.

 

 

SPECIFICATION
Resolution
12-bits on all analogue outputs
Gate (x4)
scaleable from 5V to 10V (factory build = 5.0V)
Note (x4)
1V/Oct
Velocity (x4)
0-10V
Pitchbend
-1V through to +1V
Mod Wheel
0V through to 10V
After touch
0V through to 10V
Sustain
0V, 10V when on
CC1 - CC4
0V to 10V
RETRIGGER
When set to on and a new note comes in whilst an old one is held, the gate will ‘dip’ briefly
Mode
MONO1
All four outputs operate in UNISON and are assigned to the same MIDI Channel
MONO2

Output 1 is assigned to a MIDI Channel.
Output 2 is pre-assigned to 'output channel 1' + 1
Output 3 is pre-assigned to 'output channel 1' + 2

Output 4 is pre-assigned to 'output channel 1' + 3

POLY
Polyphony Mode

IGNORE/STEAL

(Poly mode only)

This allows you to select what happens to incoming notes when you have 4 held down.
Poly1 new notes are ignored, Poly 2 the oldest note is replaced
ASSIGN

This allows you to assign MIDI CC’s to the 4 ‘CV’ outputs.

It will also allow the user to 'reset' the POLY mode and can also be used to aid calibration of connected VCOs.

Module Width
30HP
Module Depth
60mm
+12V @
120mA
-12V @
20mA

Build Guide

Email:  elby-designs@bigpond.com
© Copyright 2000. All rights reserved.     Revised: December 30, 2025