Waldorf Pulse 2 - Manual (Page 46)

Additional Settings
Pulse 2 User Manual 46
Filter Tune - Loud!
The filter is tuned at the factory prior to shipping and, as
a rule, is very stable. However, the Pulse 2 is an actual
analog synthesizer, so diverse factors may cause slight
tuning problems. Therefore we recommend that you re-
calibrate it from time to time. On demand, the Pulse 2
executes this function automatically.
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The Pulse 2 will generate high-volume output
during calibration, so turn volume down as well
as the volume of your speakers or alternatively
disconnect the audio output
Information
This functions displays the actual installed firmware
version as well as the serial number of your Pulse 2.