 SFX-09 Double Back Compressor
1. True Bypass Switch
All Seymour Duncan stompboxes are true bypass,
removing the signal path from the circuit.
2. Sustain Knob
The Sustain Knob determines the length of
sustain. With plenty on tap, higher settings
can dramatically increase sustain, as well as the
natural noise level present in your guitar signal.
3. Attack Knob
The Attack Knob adjusts the attack speed
from immediate to 50ms. Use a lower setting
to tightly track everything you play, or a
higher setting for a smooth, natural-sounding
compression.
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4. Double Back Knob
One of the most unique features of the
Double Back Compressor, the Double Back
knob blends in the uncompressed signal to
restore some of the dynamics and “feel” lost
in compression. The dial allows anywhere
from 0 to 34dB of dry signal to be mixed
back in to the output.
5. Double Back EQ Switch
Toggles between three Double Back frequency
options: “High” (blends only top
end so sharp attack and harmonics still come
through), “Mid” (blends back mid-range
frequencies for fattening up your tone), and
“Full” (blends back the full frequency range
to enrich overall dynamics).
6. Volume Knob
Used to achieve the desired level balance
between the sound through the compressor
and the bypassed sound.
Other Features Not Pictured:
Voltage Controlled Amplifier (VCA)
Compressor type
Compression Ratio adjustable from 1:1 to 20:1.
Distortion less than 0.3% at 300mV RMS
output at 1 kHz.
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 SFX-10 Déjà Vu Tap Delay
1. Tap Tempo Switch
Pressing the Tap Tempo Switch in time with the
beat will adjust the delay rate to match the song.
2. Ratio/Delay Time Toggle
Switches between a ratio (see below)
and a set delay time.
3. Ratio/Delay Time Knob
Rate Mode: Adjusts the rate of the delay
effect, from 32 ms to 6 seconds; fully clockwise
enters the Déjà vu’s loop mode.
Ratio Mode: Switches between five distinct
tempo subdivisions: 1:1 (half notes), 1.33:1
(dotted eighth notes), 2:1 (quarter notes), 3:1
(triplets), and 4:1 (sixteenth notes).
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4. Tempo LED
The “Heartbeat” LED acts as a visual
guide to help keep the tempo.
5. Modulation Knob
Lets you add a flanger/chorus effect
to the analog delay signal. Sweeps through
rate and depth settings on the same knob.
6. Feedback Knob
Dictates how many repeats play before the
sound fades away. Fully counter-clockwise allows
only one repeat, while moving it clockwise
increases the repeats beyond infinity.
7. Digital/Analog Blend Knob
The Blend control sets the level of balance
between the warmth of a Bucket Brigade
delay and the clean sound of a microprocessor-
based digital delay.
8. Active LED
The Active LED lights up when the
delay is engaged.
9. Dry/Wet Blend
Dials in the amount of delay heard in relation
to the original signal. Hard left will produce dry
only while hard right will produce delays only.
10. True Bypass/Trailing Repeats Switch
Switch selectable between hardwire true bypass
and electronically switched trailing repeats.
11. True Bypass Switch
Other Features Not Pictured:
Using a volume pedal as a control, you can
adjust the level of the delay and/or the
amount of repeats.
The Wet Out jack allows a loop to be created
after the delays are sent from the unit, allowing
effects to be added to the delay trail.
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 SFX-11 Twin Tube Blue
1. Channel Select Switch
Toggles between Lead and Rhythm channels.
2. Lead Channel Gain Knob
Controls the gain for the Lead channel.
Provides varying degrees of overdrive, from
bite to super-hot lead tones.
3. Lead Channel Volume Knob
Controls the volume for the Lead channel.
Regulates loudness relative to the other channel
and to the bypassed sound.
4. Rhythm Channel Gain Knob
Controls the gain for the Rhythm channel.
Provides varying degrees of overdrive, from
clean tube tone to crunch.
5. Rhythm Channel Volume Knob
Controls the volume for the Rhythm channel.
Regulates loudness relative to the other
channel and to the bypassed sound.
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6. Treble Tone Knob
Controls high frequency content in both channels
with greatest effect in the 2 kHz – 20 kHz range.
7. Bass Tone Knob
Controls low frequency in both channels with
greatest effect in the 40 Hz – 200 Hz range.
8. True Bypass Switch
Switches between true bypass and the channel
activated by the Channel button.
Other Features Not Pictured:
Two premium, subminiature Phillips-Sylvania 6111
dual triode tubes; 100% vacuum tube signal path.
Fully encapsulated toroidal transformer.
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