Manual AAS Ultra Analog VA-2 (page 40 of 66) (English)

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40 Parameters

after the EQ module. In this conﬁguration, the control signal of the Compressor is then the output

signal from the EQ module while the input signal to the compressor is determined by the position

of the SC button. When it is on, the Compressor is in a side-chain conﬁguration. The input signal

of the Compressor is then the output signal from the synthesizer. When it is off, the input signal

of the Compressor is the output signal from the EQ module.

Using the compressor in side chain conﬁguration is useful when one wants to trigger the com-

pressor using other criteria than the general level of the signal to be compressed. For example, a

sound with a lot of bass would easily trigger the Compressor when playing low notes. In order

to avoid that, the EQ module would be set to ﬁlter out low frequency components. This signal

would then be used to control the Compressor while the input signal to the Compressor would

still include these low frequency components.

The attenuation or gain reduction level meter, located in the middle of the module, indicates

the amount of compression applied by the module. It is the difference between the input and output

signals of the module before makeup gain is applied.

4.3.3 Delay

The Delay module consists in a stereo feedback loop with a variable delay in the feedback. It is

used to produce an echo effect when the delay time is long (greater than 100 ms) or to color the

sound when the delay time is short (smaller than 100 ms).

The Delay knob is used to adjust the amount of delay, in seconds, introduced by the effect.

Turning this knob clockwise increases the delay. The Feedback parameter is a gain factor, varying

in the range between 0 and 1, applied to the signal at the end of the delay lines. It controls the

amount of signal that is re-injected in the feedback loop. In its leftmost position, the value of this

parameter is 0 and no signal is re-introduced in the delay line which means that the signal is only

delayed once. Turning the knob clockwise increases the amount of signal re-injected at the end of

the feedback loop and therefore allows one to control the duration of the echo for a given delay

time. In its rightmost position, the gain coefﬁcient is equal to 1 which means that all the signal is

re-injected into the feedback loop and that the echo will not stop. In addition to this gain factor,

low pass ﬁltering can also be applied to the signal re-injected into the feedback loop. The cutoff

frequency of this ﬁlter is controlled using the Cutoff knob.

The Pan knob is used to balance the input signal between the left and right channels. In its

leftmost position, signal is only fed into the left delay line and one hears clearly deﬁned echo

ﬁrst from the left channel and then from the right channel and so on. In its rightmost position,

the behavior is similar but with the ﬁrst echo coming from the right channel. These two extreme

position correspond to the standard ping pong effect but a a less extreme behavior can be obtained

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AAS Ultra Analog VA-2 Manual

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