Oberheim OB 12 Operating Manual - page 56

OB   12  

Z-Domain Synthesizer

176

containing the present parameters:

•

ENVELOPE DEPTH 

([ENV DEPTH] of the FILTERS section)

: regulates the depth of the envelope

applied to the filters in a range of values from +50 (maximum envelope, so maximum variation

of the sound timbre), 0 (no envelope, so no variation of the sound timbre) and -50 (maximum

negative envelope).

•

LFO1 DEPTH 

([LFO1 DEPTH] of the FILTERS section)

: regulates the depth of modulation of the

signal originating from LFO1 on the timbre of the signal leaving the FILTERS section, by

modifying the filter cut-off frequencies and varying them continuously. The range of values is

from +50 (maximum modulation), 0 (no modulation), +50 (maximum modulation with phase

the reverse of the signal obtained from LFO1).

•

KEYB. TRACKING 

(

Keyboard Tracking, [KBD TRACK] of the FILTERS section)

: Sets the keyboard

tracking depth relative to the cut-off frequency of the filters depending on which key has been

pressed on the keyboard. In the case of a low pass filter, values close to zero mean that the

cut-off frequency remains the same across the entire keyboard range. This means that higher

notes will provide a softer sound than the lower notes, with fewer partials. When the parameter

is set with values close to +50 there will be an increase in the harmonics in the higher notes,

so that they will be brighter while the lower notes are darker. Conversely, if the parameter is

set with values close to -50 the higher notes will have even fewer harmonics than in the

standard configuration (trimmer in central position). Therefore, the lower notes will be brighter,

while the higher notes will be darker.

•

F.1 FREQUENCY 

(Filter 1 Frequency, [FREQUENCY])

: parameter identical to the parameter of the

same name in the FILTERS video page, which sets the cut-off frequency of the first filter at

the envelope point of origin. It is also displayed in this video page to allow faster programming

of this section.

If we now select the ROUTING folder, it will be possible to display the parameters relating to the

connection configuration of the two filters.

•

ROUTING 

([ROUTING])

: sets the connection between the two filters, using the values:

-

SERIAL: serial connection (previous video page);

-

PARALLEL: parallel connection

containing the parameter:

•

BALANCE: regulates the balancing of the signal from the OSC.COMMON section, to be sent

separately to the two filters. If BALANCE=0 is set, the signal will be sent only to FILTER 1,

with BALANCE=100 the signal will only be present on FILTER 2. Intermediate values of