Using Hard Sync on the Moog Sub 37

What is Hard Sync

Osc 2 is modified to be in sync with Osc 1: at each cycle of Osc 1, Osc 2 is forced to start a new cycle.

This makes Osc 2 waveform more complex, with a richer sound.

The sound of Hard Sync

  • Start from an init preset
  • Turn off Osc 1 in the mixer
  • Raise the volume of Osc 2, play a few notes
  • Turn on Hard Sync, play again: Osc 2 now sounds more gritty
  • Explore the different colors offered by Hard Sync by turning up slowly the Frequency knob

For more:

  • Change Osc 2 waveform
  • Change Osc 2 octave to 4' or 2'


Why did we mute Osc 1?

To hear Osc 2 by itself. Hard Sync modifies the sound of Osc 2 only.

Isn't the frequency knob supposed to detune Osc 2?

Hard Sync forces Osc 2 to have the same frequency of Osc 1. The frequency knob ends up changing the waveform of Osc 2: with Hard Sync, the frequency knob is an extra waveform knob for Osc 2.

Why does the sound remain unchanged when turning down the frequency, or when Osc 1 octave > Osc 2 octave?

From the manual: If Osc 1 frequency > Osc 2 frequency, Osc 2 won't complete its cycle, resulting in little or no output from Osc 2.

When turning on Hard Sync, before touching the frequency knob, why was the sound different? Osc 1 and Osc 2 shared the same waveform, octave and frequency.

I don't know. But turning up or down slightly the frequency knob produces the clean sound I would have expected.

Modulating the frequency

From the manual: “Modulating Osc 2's frequency opens up some outstanding waveshaping opportunities when Hard Sync is engaged”. ^_^

Using the pitch wheel

Set the pitch wheel destination to Osc 2.

You can increase the “Bend Up” value and go even higher than what's allowed by the frequency knob.

Using a LFO

Set a LFO destination to the frequency knob (press the Mod destination button until EG TIME/PGM is selected. Press it one more time, keep it pressed and and turn the frequency knob) then increase the Modulation amount for that LFO.