My Slim Phatty is out of tune, can I send it into the factory for a retuning?

The Slim Phatty has an automatic note calibration that can be found in the menu. After letting the Slim Phatty warm up for ~45 minutes, run a Note Calibration from the System Utilities submenu of the Master menu. (include menu tree here, this information can be found on p.45 of the manual)

NOTE CALIBRATION:

This calibration option allows you to select Note calibration. This calibrates individual notes exactly for each oscillator and octave setting. Press ENTER to access the Note calibration menu.

The Note calibration menu will be displayed, allowing you to set the calibration range. The default note range is MIDI notes 12 - 116. For every one of these notes, the pitches are calibrated at each of the octave settings, from 16’ to 2’. To change the range, use the CURSOR button to move to the start or end eld, and use the VALUE knob to select the MIDI note value. Then press ENTER. 

Note: A full Note calibration using the default range (12 - 116) can take about two hours to complete. By specifying a narrower range of notes, however, you can shorten the calibration time.

You will be asked if you wish to proceed. Use the VALUE knob to select YES or NO. If you are uncertain or if you change your mind about performing this calibration, select NO and press ENTER. You will be returned to the System Utilities Calibration menu. Otherwise, select YES and press ENTER.

Calibration will begin, and the display will appear as shown. The values displayed are the MIDI note number being calibrated, the calibration value (this is the value stored in the SP’s EEPROM), and the actual measured note in MIDI Note Number Cents (in the example shown here, ‘32.01’ indicates MIDI note 32 and the actual measured note is 01 cents sharp). 

Note calibration will proceed through the speci ed range of notes, tuning each note individually, rst for oscillator 1 and then oscillator 2.

Note: You can exit out of Note calibration at any time by pressing the MASTER button. Only those notes that have been calibrated up to that point will be saved. The remaining notes will revert to their previous calibration values. Interrupting the Note Calibration operation in this manner may result in inaccurate tuning.

When Note calibration is complete, the message ‘SUCCESSFUL’ will appear on the display and the new calibration values will be stored in the SP’s EEPROM. To exit the calibration, press ENTER to return to the System Utilities Calibration menu or press MASTER to exit the calibration and return to the highest level of the System Utilities menu. 

It is recommended to run the Osc 2 Freq calibration immediately after the Note Calibration concludes. (p. 47 of the manual)

OSCILLATOR 2 FREQUENCY (OSC2 FREQ):

This option allows you to select OSC2 Frequency Calibration. This calibrates the OSC2 FREQ control so that turning the editing dial all the way CCW turns OSC2 down exactly a fth (-7 semitones) and turning all the way CW turns OSC2 up exactly a fth (+7 semitones). Press ENTER to access the OSC2 Frequency Calibration menu.

You will be asked if you wish to proceed. Use the VALUE knob to se- lect YES or NO. If you are uncer tain, or if you change your mind about performing this calibration, select NO and press ENTER. You will be returned to the System Utilities Calibration menu. Otherwise, select YES and press ENTER.

Calibration will begin, and the display will appear as shown.The rst number that appears on the display is the base note for calibration (MIDI note 60). The second number is the calibration value (this is the value stored in the SP’s EEPROM), and the third number is the actual measured note, which is displayed in MIDI Note Number Cents (in the example shown here, ‘64.37’ indicates MIDI note 64, and the actual measured value is 37 cents sharp). 

When calibration starts, the SP rst tunes itself to the base note. As this happens, you will see the measured note value hone in on 60.00. Then the calibration value will change as the note climbs to 67.00, at which point it has calibrated the maximum value (+7 semitones), and then the note descends to 53.00 at which point it has calibrated the minimum value (-7 semitones).

When the calibration is complete, the message ‘SUCCESSFUL’ will ap- pear on the display and the new calibration values will be stored in the SP’s EEPROM. To exit the calibration, press ENTER to return to the System Utilities Calibration menu or press MASTER to exit the calibra- tion and return to the highest level of the System Utilities menu.