Polysex Voted One Of The Ten Best Synth Mods

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Attack magazine voted Tubbutec Polysex on of the ten best synth mods.

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At a glance, you’d be forgiven for missing the fact that a Korg Polysix had been upgraded with Tubbutec’s Polysex mod. The additional controls are so neatly added to the front panel that – as long as you can find three original knobs to slip onto the new rotary pots – you have to look closely to realise it’s a custom addition.

Berliner Tobias Münzer produces a small range of MIDI-based mod kits for synths including Korg’s Poly61 and Mono/Poly and Roland’s Juno-6 and -60, but his analogue upgrade for the PolySix is our favourite. Released in 1981, around the same time as the Juno-6, the Polysix was a much more affordable synth than anything Korg had made before. With a single VCO per voice, each with sub-oscillator, great filters and built-in modulation effects, the Polysix is good in standard form, but Tubbutec’s simple but effective Polysex mods lift it to new heights. The pitch mod feature routes the envelope generator to oscillator pitch, while the voice spread feature detunes the oscillators for thick unison sounds or wobbly polyphonic patches.
(Via Attack Magazine)

DCB cover panel – solutions

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The DCB cover panel for the Juno-66 was designed to fit the Juno-60 here in the Tubbutec headquarters.
As it turns out there are however either two different versions of the Juno-60 (with respect to the panel mounting).
While our Juno-60 uses self-cutting screws to mount the panel, one customer reported that his Juno-60 uses machine screws.
There are multiple possibilities to use our panel – which was designed to work with self-cutting screws.

  1. Cut a thread. This is by far the cleanest solution. By using a die for M3 screws, cut a thread in the two holes on the sides of the Tubbutec DCB panel. The holes are large enough and no additional drilling is needed beforehand.
  2. instead of cutting a thread use a 3.5 mm drill to enlarge the two holes, then use the original Juno-60 screws in combination with 3mm nuts to mount the panel.
  3. Use black self-cutting screws instead of the original ones.

We apologize for the inconvenience. From now on the panels will ship with a thread so it will work with both, machine screws and self-cutting ones.

Poly-61 CV injection points

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poly61CVpoints

These are some CV injection points of the Poly-61. You need to connect the CV with an additional resistor. Try 100k.Decrease the value for a stronger effect and increase it for a weaker influence.

If you connect one side of the potentiometer to +15V and the other one to -15 you can adjust the value up and down with the center position as default. In  this case use the following resistor values:

Cutoff: 100k
Res: 330kAttack: 330k
Decay: 330k
Sustain: 220k
Release: 220k
MG speed: 220k

These give you about the same range as the original controls.

In case you are using the CV outtputs of the ModyPoly, connect a 100nF capacitor across the negative input and the output of the opamp to filter out high frequencies.

This is not tested but I am pretty sure it is working.

[edit: Cutoff, resonance, attack and decay work very well. Very complicated to add control to the other parameters]