Doepfer A-146 LFO 2 (variable Waveform) Manual de usuario descargar pdf (Pagina 5)

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System A - 100

LFO 2 A-146

• Variable pulse width

In using the square wave for AM or FM in the audio

range, it’s possible to control the

timbre

by adju-

sting the pulse width, because the amount of over-

tones (and sidebands) present is directly related to

the width of the pulse.

The A-146’s pulse width control also comes in

useful when using the LFO as a trigger or gate

generator for repeated sequences. The patch in

Fig. 3 is an example: the envelope (set to a dura-

tion t

which is shorter than the LFO’s half-cycle),

gives the rhythm a more percussive feel. Whereas

with the A-145, an extra A-162 trigger delay module

would have to be used to adjust the gate duration

(Delay = 0, Length =...) to t

, that’s not the case

with the A-146: you simply have to adjust the pulse

width.

• Positive square wave output

This output has the useful function of being able,

unlike a normal positive/negative square wave, to

create pitched repeats which stay in tune.

Fig. 3: Producing gate pulses of variable duration

In Fig. 4 on page 6, the pitch of a VCO is controlled by

a CV from a keyboard, but also from the square wave

output of the A-146, via input CV2. The voltage at CV2

is set with the attenuator to exactly 1 volt.

A-145 A-162 ADSR

A-146 ADSR

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Doepfer A-146 LFO 2 (variable Waveform) Manual de usuario Pagina 5