Fostex 3070 - Page 4

1. LOCATION OF CONTROLS (Front panel)
(1) COMP IN/OUT
This push-type switch determines whether the input signal
will be processed (IN) or bypass the circuit (OUT). When this
switch is OUT, all function controls on the front panel are
disabled, and the input signal will then appear at the output
jacks, unaltered.
(2) EXP GATE
When this rotary control is fully CCW, there is a click
action indicating the OFF position. As the control is rotated
CW, the threshold level for the gating function increases
accordingly.
(3) COMP RATIO
This rotary control changes the compressor ratio continuously
from 1:1 (no limiting) through ":1 (hard limiting). As a refer¬
ence, consider two extreme settings:
A. Set to a scale of 2, the change in output level will be
ldB for an input signal 2dB higher than the threshold, and the
"O' 1 LED (reference (8) GAIN REDUCTION) will be lit.
B. Set to <*>, there will be no change in output level for
input signals higher than the threshold. When the DETECT LIMIT
LED (reference (10)) flashes, the maximum gain reduction will
be 32dB.
(4) ATTACK
The signal level of the compressor is controlled by an inter¬
nal VCA (Voltage Control Amplifier). The response time of that
VGA is determined by this rotary control, which is continuously
variable from 0.2 through 20 msec.
(5) RELEASE
The amount of time it takes the control circuit to recover
from processing and return to unity gain is determined by set¬
ting this continuously variable rotary control from 50 msec,
through 2 sec.