6
to the vca out socket in Praga. This same sig-
nal is used for the auxiliary send (post fader).
However, before the a/b knob on Praga, it
may be replaced by its processed version (or
any other signal) thanks to the aux ins inputs
in Hrad. It then goes through one of the four
additional VCA cores (one per Praga channel)
where the send level can be controlled by the
external CV plugged into the corresponding
aux cv input.
The voltage response of this VCA is the same
as in Praga (please refer to its manual for de-
tails). The CV inputs are internally normalized
to 8V.
From the VCA, the signal passes through the
bipolar aux attenuator on Praga where one
of the auxiliary channels (a or b) may be
selected, and the amount of send may be set
manually. The mixed aux send signal from all
four channels is available at the aux send
socket in Praga.
When a return signal from external process-
ing is plugged into the stereo aux return
pair in Praga, it goes again to Hrad, where
it may be attenuated with the corresponding
aux ret (a or b) knob. From the attenuator,
the signal is routed to the stereo summing bus
in Praga.
block
diagram
fig. 4: signal flow
Praga
Hrad
aux
vu
vu
control
AUX
sends
cue
solo
AUX
insert
stereo
output
signal
input
mute
AUX
return A
AUX
return B
VCA
output
chain
output
cue
input
phones
output
main
output
chain
input
pan
vol
x4
x4
x4
AUX
CV input
