Lfo As Audio Oscillator; Lfo As Trigger; Audio Trigger As Lfo-Sync; Envelope Generators As Audio-Waveshaper - Schippmann ebbe und flut User Manual

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11.3 LFO as audio oscillator

When using its CV-input (socket (6), ring) the LFO can cover a wide audio range. If the external sync

input (socket (6), tip) is triggered by a tuned synthesizer, the result is the typical 'sync-sound' . The sync

input is capable to work with almost every kind of signal. Specific trigger signals (pulses) are not requi-

red. A trigger is generated either or not.

The LFO can be used as a trigger source to start the envelope generators via its external LFO-output

(socket (4), tip). This works with all LFO waveforms. This way, tremolo-effects can be achieved with the

VCA. The LFO determines the frequency and the corresponding envelope generator works as a wa-

veshaper with its three parameters attack, hold and release.

I just wanted to remind you, that the audio trigger (socket (7), tip) can be used directly to sync the LFO.

A logical progression of the last chapter would be the adaption to any kind of audio signal. These are

also capable to trigger the envelopes. It will mostly make sense to work in AHR-mode. Please note, that

an entire AHR-sequence needs at least approx. 3 msec. This results in a maximum frequency of 330 Hz

to enable a complete AHR-sequence of the envelope. Of course even higher audio frequencies can be

used to trigger the envelopes. This would cause a sudden 'jump back' in AHR- (re-trigger) mode (see

chapter 9.5.1.) which can provide very interesting sonic results.

The voltage of +5 Volts on one of both socket-pins (5) can be used for sevaral applications.

[POLARITY]-switch (3) in position left:

[POLARITY]-switch (3) in position right:

The impedance of this voltage source is 1.2 kOhm which means a reduced voltage, if more compo-

nents like e.g. potentiometers are connected.

An example: This +5 Volts source should feed 5 potentiometers of 10 kOhm each to provide 5 variable

voltage devider. Total impedance is 2 kOhm and the resulting voltage is not +5 Volts any more but just

+3.1 Volts. So it makes sense to keep these impedances high. If 100 kOhm potis would be used instead

of 10 kOhm, impedance would be 20 kOhm and the usable voltage 4.7 Volts though.

+5 Volts at RING

+5 Volts at TIP

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