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INIT CURRENT: 

Initializes the currently playing sound and replaces it with a simple sound This function works even if the 

Preset Manager is not active.

Note: After initializing the current preset, the frequency of the main oscillator will be set to the minimum (14 

hz). Adjust the frequency controls to hear an audible signal once again.

UPGRADING FIRMWARE:

 

You will need an inexpensive “Pickit3” programmer device and a computer with a USB connection to install any 

available upgrades for this module. You may download new firmware and detailed upgrade instructions from http://

www.industrialmusicelectronics.com on the relevant product page. Note that upgrading the firmware will not disturb 

your presets or user settings.

The Pickit3 is available from your local electronics distributor, Microchip part number PG164130. The new Pickit4 

programmer will also work, part number PG164140.

TEST AND CALIBRATION:

 

Your oscillator comes from the factory with a fresh calibration job.  It may need periodic adjustment, especially 

when placed into a permanent configuration with other oscillators and CV sources - calibrate your module so it is in 

tune with the rest of your setup.

1. Prepare two control voltages measuring exactly 1V and 7V. 

2. Turn the coarse tune on the Main Oscillator to the minimum position, and turn the fine tune control to center 

position.

3. Insert the 1V voltage into the Main Oscillator CV input (1v/oct), and adjust the oscillator's fine tune until the 

tuning display is entered on note C1.  

4. Replace the 1V input voltage with 7V. Adjust the trimmer on the rear of the module (labeled OSC1SCALE) 

until the display is centered on note C7.

Repeat steps 3 and 4 until no further adjustment is needed.

The second calibration is for Operator A's 1v/oct CV input. You will need to use a tuner.

1. Prepare two control voltages measuring exactly 1V and 7V. Plug your tuner into the AUX output.

2.  Use the OPTIONS menu to assign Operator A to the AUX OUT.  

3. Use the OPERATOR MENU to change Operator A to Free mode.

4. Turn the coarse tune on Operator A to the minimum position, and turn the fine tune control to center position

5. Insert the 1V voltage into the Operator A CV input (1v/oct), and adjust the oscillator's fine tune until the tuner 

displays note C1.

6. Replace the 1V input voltage with 7V. Adjust the trimmer on the rear of the module (labeled OSC2SCALE) 

until the tuner displays note C7.

Repeat steps 5 and 6 until no further adjustment is needed.

FACTORY RESET:

 

To perform a factory reset, make sure that NO patch cables are plugged into the module. Turn the module on 

while holding the Preset Mode button. The menu settings, CV input calibrations, and preset data will be reset.

MORE INFORMATION:

 

Find the latest firmware, waveforms, and other information:

http://www.industrialmusicelectronics.com/products/22

Need more help?

 Write to [email protected].

Summary of Contents for HERTZ DONUT MARK III

Page 1: ...HERTZ DONUT MARK III OPERATIONS MANUAL FIRMWARE V1 0...

Page 2: ...able in a menu The MIX output is a simple analog combination of both outputs SCREEN SAVER The Hertz Donut s display is an OLED It is set to a brightness to provide the best balance between visibility...

Page 3: ...meters When all three parameters are set to zero a sine wave is produced The first and default FOLD setting is the Phase Distortion shown as PDist on the display This modifies the ramp that is used to...

Page 4: ...Donut is achieved by thru zero frequency modulation This means that the instantaneous value of an audio signal is used to modulate the frequency of the CARRIER oscillator This causes a predictable out...

Page 5: ...ollows the main oscillator frequency The display shows the approximate note number of the generated frequency Free This is similar to Follow but the operator does not track the main oscillator frequen...

Page 6: ...as a user selectable behavior in the OPTIONS menu You can select either operator A or B the sum of them both or the digital XOR of them resulting in a harsh sound similar to ring modulation DUAL OSCIL...

Page 7: ...NG indicator is present or not To exit EDITING mode press the rotary encoder again IMPORTANT You must choose Save Presets from the PRESET menu to write your changes to memory They will not be stored p...

Page 8: ...d pressing the button closest to the display RANDOMIZE CURRENT When selected the random preset generator will create a new sound setting The parameters to be changed are subject to the Preset Scope se...

Page 9: ...er position 3 Insert the 1V voltage into the Main Oscillator CV input 1v oct and adjust the oscillator s fine tune until the tuning display is entered on note C1 4 Replace the 1V input voltage with 7V...

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