Operation Manual

4.2 The Edit View 31

Finally, signal from the Filter 1 module can be routed to the input of the Filter 2 module. The

amount of signal is controlled using the Filter 1 knob appearing on the mixer of the second ﬁlter.

In order to have the two ﬁlters strictly in series, this knob should be turned clockwise and the VCA

1 switched off as the output of the ﬁrst ﬁlter is hard wired into the input of the VCA 1 module. In

this way, the output signal only comes out from the second ampliﬁer after going through the two

ﬁlters.

4.2.3 The Ampliﬁer Module

After ﬁltering, the signal is routed to an ampliﬁer in order

to add an amplitude envelope and panning effect to the sound.

Both the Filter 1 and Filter 2 modules have their own ampliﬁer

section, the Amp 1 and Amp 2 modules, which allows one

to keep the signal coming from each ﬁlter totally independent

from the other.

The two main controls of the ampliﬁer module are the Level

knob and the Pan knob. The Level knob is used to adjust the

overall level of the ampliﬁer while the Pan knob is used to posi-

tion the sound in the stereo ﬁeld. The source can be positioned

from left to right by turning the Pan knob clockwise; it is cen-

tered when the knob is in its center position.

The level of the sound is always modulated by the signal

from the Amp Env module which is hard-wired to the Amp

module. The level of the sound across the overall range of the

keyboard can also be adjusted using the Key modulation knob.

In its center position, the sound level is the same across the keyboard. Turning the Key knob

clockwise boosts high notes and decreases the amplitude of low notes while turning it to the left

boosts low notes while decreasing the amplitude of high notes. Note that the middle C key (C3,

MIDI note 60) always sounds a the same level regardless of the position of the Key knob. The

output signal from the LFO module can be used for adding a tremolo effect to the sound.

The pan value can be modulated by signals from the LFO, the Amp Env modules and the

pitch of the note played. The modulation signals moves the source relative to the source position

determined by the settings of the Pan knob. Negative values of the modulation signal move the

source to the left of the source while positive values move it toward the right.

Using the LFO module as a modulation source moves the signal from left to right at the fre-

quency of the signal from the LFO module. Using the signal from the Env module as the modu-

lation source moves the source to one side of the source and brings it back to its original position.

Note that since the sign of the envelope signal is always the same, the source would need to be

positioned completely to the left or to the right (Pan knob in its leftmost or rightmost position) in

order for the source to sweep the entire space. Finally, the pitch signal from the keyboard positions