Patch (Preamp Out And Power Amp In); Setting Levels For External Effects - Rivera R100-212A Owner's Manual

The footswitch jack can also be used to connect the optional FS7M MIDI interface. This
allows the amp to be controlled by any MIDI controller including the Rivera Head
Master. The MIDI interface replaces the footswitch, the interface and the pedal cannot
be used at the same time.
Patch (Preamp Out and Power Amp In) - R30-112 and Chubster 40
The Thirty Twelve's Patch section is optimized for driving slave amps or accepting the
signal from another amp's preamp so that the Thirty Twelve can act as a slave. When a
jack is inserted into the Patch's Power Amp In jack, the connection between the preamp
and power amp sections is broken. Therefore, any signal that comes in through the
Power Amp In goes directly to the power amp section and the speaker. You can use the
Preamp Out to send a signal to another amp, and if nothing is plugged into the Power
Amp In, the signal also goes to the Thirty Twelve's power amp section and speaker.
Of course, you can use pedals and rack-mounted effects between your guitar and the
amp. In fact, that's where most wah-wahs and other pedals sound exceptionally good.
However, rack signal processors are often best suited to being placed after the
preamp's tone-shaping circuitry. Your Thirty Twelve or Chubster 40's Patch section is
designed to provide a solid signal that's just right for most line-level effects. Note: The
Preamp Out can be used to route a signal to a guitar tuner.
The Patch section comes after the preamp and reverb sections. In addition, its circuitry
is designed to drive line-level signal processors and other power amps or slave amps
with excellent results. It can connect directly to P.A. and mixing consoles. (Because the
signal is electrically unbalanced, you can use an unbalanced-to-balanced output
transformer to connect to equipment requiring a balanced input.)
Before you connect a signal processor to your amp, either turn the amp off or to
standby.
Use high-quality shielded cords between the amp and processor. Never use a speaker
cord.

Setting levels for external effects

1. Connect the amp's Preamp Out and Power Amp In with the signal processor's input
and output.
2. Plug in your guitar, turn on the signal processor, and then turn on the amp (wait a
minute for it to warm up).
3. Set the signal processor's input level so that you don't overload the processor. Keep
your ears open for unwanted distortion from the signal processor (you'll know it by its
crackly, unmusical sound). Whack a few chords on your guitar to check that your
settings are correct.
4. Now turn up the signal processor's output level until you hear the proper volume and
overdrive and the lowest amount of noise. This level is usually equal to the level that
passes through your amp when nothing is plugged into the Patch jacks.
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