Oberheim OB 12 Operating Manual - page 58

OB   12  

Z-Domain Synthesizer

178

time taken to reach the DECAY 2 value or the SUSTAIN value (if the DECAY 2 moment of time

is not present) from the moment when the maximum cut-off frequency (maximum level of the

ATTACK section) is reached. The values available range from 0 (DECAY 1 time annulled) to

100 (maximum time taken to reach DECAY 2 or SUSTAIN)

•

SUSTAIN 

([SUSTAIN] of the FILTERS section)

: regulates the SUSTAIN level, i.e. the filter cut-off

frequency kept stable until the key is released (see also SUSTAIN TIME). The range of values

is from 0 (after DECAY 2 the cut-off frequency goes back to that set using the F.1 Freq. and

F.2 Delta parameter) to 100 (maximum variation of the cut-off frequency, until release of the

key).

•

RELEASE 

([RELEASE] of the FILTERS section)

: sets the release time, i.e. the time the cut-off

frequency takes to reach the value set with the F.1 FREQ. and F.2 RATIO parameters. The

range of values is from 0 (the cut-off frequency goes back to that set with F.1 Freq. and F.2

Delta) to 100 (maximum period of time taken to return to the values of the cut-off frequency

set with the parameters mentioned above).

Thanks also to the display section which shows the envelope graph, the user can be informed

about both the envelope referred only to the ADSR parameters (graph with continuous line), and

the envelope referred to the Env. Depth, F.1 Freq. and F.2 Delta parameters (graph with dotted

line).

If the ADV-ENV folder is now selected, the user can display the second page relating to the

envelope to be applied to the filters. This video page comprises:

the parameters displayed are the following:

•

DELAY: sets a delay time from when a key is pressed to when the filter cut-off frequency

starts to be affected by the envelope, in a range of values from 0 (no delay) to 100 (maximum

delay).

•

DECAY BREAKP. 

(Decay Breakpoint): sets the Breakpoint value for the Decay period, divided

into Decay 1 and Decay 2. The Breakpoint value specifies the cut-off frequency after which

Decay 2 will start, in a range of values from 0 (minimum cut-off frequency) to 100 (maximum

cut-off frequency).

•

DECAY 2: regulates the second period of time taken to reach the Sustain level by means of

the usual range of values from 0 (no Decay 2 section) to 100 (maximum time to reach the

Sustain level).

•

SUSTAIN TIME: regulates the Sustain time, i.e. the period of time in which the cut-off frequency

assumes a fixed value. If this period of time is less than the real time for which the key is

pressed, the cut-off frequency of the filters will decrease (or increase if envelope is inverted)

regardless of the status of the key (pressed / released). The range of values is from 0 (Sustain

section absent) to OFF (the cut-off frequency is no longer controlled, and thus remains

unchanged until the key is released).

This video page also shows the envelopes referred both to just the ADSR parameters (continuous

line) and to the Env. Depth, F.1 Freq. and F.2 Delta parameters (dotted line).