Kristofer Ulfves wrote:
> I wonder if there's any way to manually adjust the range of detuning
> between the oscillators in Unison-mode? Anyone?
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On KLM-366 (synthesizer / key assigner board) there is a 4051 switch
which is enabled in UNISON mode. This switch switches different
resistors as a load to the oscillator control voltage, which results
in detuning the oscillator slightly. The 4051 is IC30, and the resistors
are R120 (33k to +5V) for voice #1
    R119 (68k to +5V) for voice #2
    R121 (68k to -5V) for voice #3
    R122 (33k to -5V) for voice #4

Voice #0 and voice #5 are switched to GND.

Additionally there is switch SW1, a slider switch on the KLM-366 pcb,
which enables (front position) / disables (rear position) streched
tuning. Electrically it shorts R125 (130R) when closed (streched
tuning enabled, I think).

Johannes                              
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The unison detunes are set by R119..R122 around IC30 (4051) on KLM-366.
Changing these resistor values should change the amount of detune.

/Ricard                                    
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Right the resistor you are changing to get your 7 semitones detune is
simply one half of a potential divider. By changing R116, a 220R
resistor, you can alter the bottom half of that divider. By just over
doubling the value to 470R, you will get twice the detune range for ALL
four of the detuned voices.

If you want twice your detune range just alter that one resistor to 470R
and keep using your 1M value. But my reckoning was that if I wanted that
amount of detune I would use the chord hold function on the mode
assigner.

Now what you really need is six sets of pots connected to that unison
circuit. Six 47K linear pots between the power rails, +/- 5V. Feeding a
100K resistor from each wiper to each of the de-mpx inputs in the unison
circuit. This way you would detune either side of perfect note. You
would need some track cuts, but if you can afford the extra panel space
it may be worth it. You could still use my original mod to control the
overall level of detune.

Regards,

Tony Allgood  Penrith, Cumbria, England
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