Block Diagram - Xaoc Devices PRAGA Operator's Manual

block
diagram
VCA
output
main summing bus
aux summing bus
control
pan vol
signal mute
input
CV CV
pan volume
1
CHANNEL MUTING
Regardless of the current mode, a short-press
on the active|mode button silences the cor-
responding channel. This state is indicated
by the deactivation of the corresponding
LED. Clickless action is achieved by introduc-
ing a few-millisecond fade-out to near -90dB.
Pressing the button again brings the channel
back through a similar clickless fade-in and
reactivates the LED.
The operation of mutes can be controlled
remotely through the expander pins at the
back of the unit. The planned Hrad expan-
sion module offers four gate inputs for auto-
mated channel muting.
aux
insert
point
vu
control
pan vol
signal
input
CV
pan
2 3
VCA chain
output input
aux
insert
point
vu
mute AUX
return
1+2
CV
volume
4
PAN CONTROL
Praga offers both manual and CV control
over the position of each channel in the out-
put stereo panorama. The pan knobs act
as offsets to the pan input control voltages
which are expected in the range of -5V to
+5V. The response of the combined controls
provides equal loudness in a near-field mon-
itoring setup (3dB pan law), however as
channel gain approaches 0dB, the response
is slightly compressed so as to prevent an in-
crease of loudness (see fig. 6).
VCA OUTPUTS
A direct vca out on each channel uses a sep-
arate VCA chip to provide a pure copy of the
5
chain
output
stereo
output
AUX
sends
fig. 2