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User’s Manual Pulse • PulsePlus
14.1 Tuning the Filter
The filter is tuned at the factory prior to shipping and, as a rule, is very stable. However, the
Pulse 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
executes this function automatically.
☞ This is how you activate the Filter Tune function:
• Press the Shift key 햺 and hold it down.
• Briefly press the Mode key 햶. You are now at level at which Sysex data transfer is
executed. The Filter Tune function is also located here.
• Release the Shift key 햺.
• Use the scroll key ▲ 햻 to call up the Filter Tune function. It is located right after
the All Dump function.
• Press Dump 햶 again while holding the Shift key 햺 down.
The filter is tuned automatically.
This process can take up to 30 seconds. The following functions are executed:
• First, the filter is tuned to its fundamental frequency. This means the filter is
adjusted to 440Hz at maximum oscillation of the resonance frequency. The display
indicates the current value for the filter cutoff frequency.
• Then the filter is tuned an octave above the fundamental frequency, i.e. to 880Hz.
The Pulse's audio output is switched off during the filter tuning process. Once the
filter has been tuned properly, the Pulse is ready to be played.
The Filter Tune function can also be activated via a MIDI Tune Request command.
Conversely, the Pulse sends a MIDI Tune Request when the "Tune" function is
activated.
Filter Tune:
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