Functional Test Mode

Should you have a problem with the modules, our support team will ask you to run “test mode” to have a rough idea of what the problem is. This mode is also the mode used in factory to functionally test and calibrate the modules before they are delivered to you.

This operation requires a bit of care because you will need to access the back of your module while turning the module on, in order to access test mode.

As for equipement, you will need:

  • A simple LFO and VCO

  • A stable 3V voltage source such as one coming from a Volt/Octave device (an external or Eurorack device, such as the Arturia Beatstep Pro or Intellijel µMIDI or equivalent will do)

Entering Test Mode

To enter test mode:

  1. Turn off your Eurorack system

  2. Remove all the Eurorack patch cables connected to the module

  3. Remove the module from the rack, but keep its power cord attached

  4. Press the FLASH_SW button at the top, between the two printed circuit boards of the module, keep it pressed, and turn on your Eurorack system. The test mode welcome screen will appear

  5. Press FUNCTION, the screen will turn entirely white. Check that the screen is working properly, and press FUNCTION again

The screen will show something similar to:

DETECTED
BOHM
GROOVE
PERFORMER

Make sure that all your expanders appear in that list. Then:

  • To only test the expanders, click the FUNCTION button

  • To test all the modules, press the FUNCTION button for at least 1 second

Testing Expanders

If the Groove expander is present:

  1. Check that the CLOCK LED is blinking, press FUNCTION

  2. Turn the 2 knob fully on the left, then fully on the right, then press FUNCTION

  3. Repeat the previous step for the 3, 4, LENGTH, PITCH, FX, COLOR knobs, VOL slider, and then for the FX, and COLOR attenuverter trims

  4. Acknowledge that you have already removed all patch cables and press FUNCTION

  5. Wait until the module calibrates CVs automatically

  6. Use your LFO in sinus mode and connect it to the FX CV

  7. Repeat the previous step for CLOCK, COLOR, VOL, LENGTH, PITCH, and TAP CVs

  8. Connect a cable between the TAPS CV output and TAPS CV input, then press FUNCTION

If the Performer expander is present:

  1. Press the ON/OFF button

  2. Check that the ON/OFF LED is blinking, press FUNCTION

  3. Turn the DUCK knob fully on the left, then fully on the right, then press FUNCTION

  4. Repeat the previous step for the FX knobs and VOL slider

  5. Acknowledge that you have already removed all patch cables and press FUNCTION

  6. Wait until the module calibrates CVs automatically

  7. Use your LFO in sinus mode and connect it to the DUCK CV

  8. Repeat the previous step for FX, ON/OFF and VOL CVs

  9. Use your VCO in sinus mode and connect it to the right input IN first

  10. Repeat the previous step with the left input IN

After the expanders have been calibrated, CALIBRATION SAVED will appear on the screen. Clicking the FUNCTION will show the “QC passed” stamp, which means that your module is in specs (no problem were found) and calibration is complete.

You can now turn off your Eurorack system, and reinstall the module into your rack.

Testing All Modules

It is completely similar to the expanders test, except the central Bohm module will be also tested and calibrated. For this reason you will need, on top of the LFO/VCO requirements for the expanders, a stable 3V voltage source.

Typically, you will want to use a Eurorack sequencer, or a MIDI to CV module.

If you are only testing the module and don’t have a stable 3V voltage source, you can turn off your Eurorack system before reaching the CALIBRATION SAVED step mentioned in the previous section.

  1. Press the HIT button

  2. Check that the HIT LED is blinking, press FUNCTION

  3. Make sure a SD card is in the microSD card slot and press FUNCTION

  4. Read the SD card test status and press FUNCTION

  5. Turn FUNCTION 10 times on the left, then 10 times on the right

  6. Turn the LENGTH knob fully on the left, then fully on the right, then press FUNCTION

  7. Repeat the previous step for the SUSTAIN, ATTACK, PITCH, CURVE, TRS DECAY, COLOR, FX, TRS TONE knobs, and then for the LENGTH, SUSTAIN, PITCH and COLOR attenuverter trims

  8. Acknowledge that you have already removed all patch cables and press FUNCTION

  9. Wait until the module calibrates CVs automatically

  10. Use your LFO in sinus mode and connect it to the LENGTH CV

  11. Repeat the previous step for ATTACK, SUSTAIN, HIT, PITCH, CURVE, COLOR, TRS DECAY, TONE, FUNCTION, VELOCITY and FX CVs

  12. Connect a cable between your stable 3 Volts source and PITCH CV input, then press FUNCTION

  13. Wait until the module calibrates the PITCH CV automatically

  14. Connect a patch cable from OUT left to your audio output and make sure a 440Hz tone is playing, press FUNCTION

  15. Repeat the previous step with OUT right

The test mode and calibration will then follow with the present expanders if any. For more details, follow the instruction in the previous section.