Doepfer A-151 Quad Sequential Switch Manual do Utilizador descarregar pdf (Página 5)

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System A - 100

Quad Sequential Switch A-151

5. User examples

Switching VCO waveforms

In the example in Fig. 2, every time a trigger pulse hits

the A-151’s trigger input socket, the VCO switches to a

new waveform. Since very fast switching of the A-151

(by an LFO set to its fastest range, or even by a VCO)

can produce audio frequency modulation - that is,

changes so fast that the ear can’t resolve them - the

result is in effect a new waveform.

Fig. 2: Switching VCO waveforms

As an alternative to using an LFO or VCO to

trigger the waveform sequencing, it’s possi-

ble to get the VCO to trigger the switching

itself. Simply connect the square wave out-

put into the trigger input ! of the A-151.

Four-step tone sequencing

The patch in Fig. 3 on page 6 produces a four-step

tonal sequence, with a different filter envelope for each

of the four steps.

An LFO simultaneously triggers ADSRs 1 to 4 and the

switch on the A-151, so that for each step the VCF is

affected by a different one of the four envelopes.

ADSR 5 is also triggered by the LFO, and controls the

VCA.

It’s crucial to make the envelopes of all the

ADSRs fit the LFO’s speed.

A-110

VCO

Trig. In

A-151

SEQ. SWITCH

Res. In

O/I

I/O 1

I/O 2

I/O 3

I/O 4

LFO

1 2 3 4 5 6

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Doepfer A-151 Quad Sequential Switch Manual do Utilizador Página 5