3.2.4 Loop as Second Master Volume
Those of you who can live without processors in the parallel loop can use this loop for a
second master volume for each channel.
To do this, just loop a short 1/4” cable from send 2 to parallel loop return. Now you can
choose a second master volume by turning the mix control past 1:00 PM to full open, and
push the send 2 button to activate your second master volume. To do this for the VH4S,
you must use a Y-cable and send the signal from send 2 to parallel return A and B.
3.2.5 Reasons for Loss of Dynamics
Many different factors can be responsible for loss of dynamics, aside from those
mentioned in 3.2.3 ( ADA conversion). A vital point that often leads to frustration is a
maladjusted output level of an effects unit. If the output level is too high, then unwanted
distortion is caused in the power amp. If it is too low, then the rig will not sound punchy
and might get lost easily in the band sound. When used in the serial loop, the output of
the effects unit determines the ultimate drive signal strength of the power amp. The
output level should be matched to give the best possible sound with all 4 channels
without over driving the power amp section. Headroom adjustments of 10% are usually
sufficient.
3.2.6 Function of the Channel Inserts
Stomp Boxes beware!
These little jewels often cause a medium to heavy wiring nightmare. If put in the signal
chain between the guitar and the amp, then one must accept massive losses of signal
purity due to the long wiring length and all the electrical connections that essentially
destroy the weak signal coming from your guitar. This holds especially true when the
units are turned off. It also adds points of potential trouble. A noticeable improvement
can be realized here by using the channel inserts. Using the Send/Return System would
add even more cabling, even though it would alleviate the signal loss problem. Channel
Inserts are perfect for the use of stomp boxes. And - they are programmable. The
channel insert button turns the insert of the selected channel on or off.
Some tips: Channel one responds well to compression. Connect the send of the channel
insert to the input of the effects unit, and the output of the effects unit to the return of
the channel insert. Turn the unit on and you are done. Now just push the insert button
and the effects unit is in the signal path for channel one. You want to program this to a
midi patch? Sure - just pick an appropriate patch on your midi controller, then hit the
store button. All selected functions will now blink. Hit the store button again and that’s it.
Your channel insert for channel one is now programmed.
We can not think of a really useful effects unit for channel two, so here is a way to loop in
your tuner. connect the tuner to the send of channel 2 insert. Now take a 1/4”jack and
connect the tip and sleeve internally. Plug it into the return of channel 2 insert. Yes - this
shorts the signal and will cause a forced muted operation of channel 2 with the insert on.
Your tuner works, but the amp is quiet while you tune. Very suave!
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