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Juno60 LPF Calibration

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Andy Harman edited this page May 17, 2019 · 2 revisions

This page attempts to identify the calibration of the Roland JU-06's LPF (which is apparently very similar to the Juno 60).

Cutoff frequency

Starting point:

  • Set all of the sliders to 0 and all of the toggle-buttons to off.
  • Set Noise to 10.
  • Set the VCA to "Gate".

Slowly increase the Freq slider until you start to hear something.

  • For the JU-06 this is approximately 4.5. For JunoX this is 6.5.

Set the ADSR sustain to 10. Set the VCF Env to 2.5. Find the Freq position where you start to hear something.

  • For the JU-06 this is 2.5. For the JunoX this is 5.9.

Set the VCF to "Invert".

  • For the JU-06 this is 6.5. For the JunoX this is 5.9. Indicates the inverted LPF modulation is not implemented.

Return the VCF to "Positive". Set the sustain to 2.5. Set the LPF Env to 10. Find the Freq position.

  • For the JU-06 this is approximately 4.0. For JunoX this is 5.9. Indicates that the sustain (which I know is linear) and the LPF Env slider are interchangable. This indicates that the LPF Env slider is also linear.

Set the VCF to "Invert" (so the Env modulation is fighting against the Freq slider), sustain to 10. For JU-06:

  • LPF ENV = 5 => Freq need to be about 9.
  • Freq = 10 => LPF Env needs to be about 5.5.

Service notes say impact of Env modulation on LPF is +-14 octaves. Above experiment indicates JU-06 Freq slider has a range less impact that the full-on env modulation.

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