TREX 8 BALL DUAL-OCTAVE User manual

Designed by T-REX Denmark, 2017
T-Rex Engineering ApS
www.t-rex-effects.com
Lars Dahl-Jørgensen
Founder
Sebastian Jensen
Founder
1st edition 2017
@trexeffects

CONNECTIONS
Input: Connect your instrument or signal source to this jack
Output: Connect the amplifier or receiving unit to this jack
DC inlet: Connect a power supply unit to this jack (9/12 VDC, center
negative, 130 mA min.)
Controls:
Mix : Controls the mix of the dry signal vs. the two octave signals.
Turn this clockwise for more overall octave volume and less
dry signal. Turn this counter clockwise for less octave and
more dry signal.
Lo A : Controls the level of the low octave for ch. A
Hi A : Controls the level of the high octave for ch. A
Lo B : Controls the level of the low octave for ch. B
Hi B : Controls the level of the high octave for ch. B
CONGRATULATIONS
On your purchase of the T-Rex 8-ball pedal!
Delivering 2 channels of polyphonic octave generation, you can foot-
switch between two separate blends of dry signal, low octave and high
octave.
For instance, you may want to add a little high octave “shimmer” to
lead lines and use plenty of low octave for powerful riffing. Or maybe
your music demands two levels of octave generation – a little and a lot.
The 8-ball allows you to set up each channel for the exact amount of
octave signal(s) and you can then easily go from one to the other.
The 8-ball uses a polyphonic, fast tracking DSP engine to generate the
octave signals but your dry, unaffected signal remains analog and is
buffered when the pedal is bypassed.

content than just the fundamental note which can create unwanted
pitch shift artifacts. Overtones, subharmonics and pitch variations when
playing chords will affect how “clean” the pitch shifting is. If you hear
strange artifacts when playing chords or a harsh sound when feeding an
overdriven/distorted signal to the pedal, it´s simply because the pedal
pitch shifts every frequency present in the signal. Hence, the cleaner
this signal is (frequency-wise and distortion-wise), the cleaner the pitch
shifting will be.
We recommend connecting the 8-ball directly to the instrument, or as
close as possible. This will make the effect more natural and pleasing to
the ear. Play simple chords or single note lines for best results.
HOW TO USE THE 8 BALL
Start by setting the mix knob to noon. This will give each octave roughly
the same volume as your dry signal when the controls are set to maxi-
mum. You can then adjust the octave controls to taste for each channel.
If you need more volume from one or more of the octave signals, turn
the mix knob up. This will bump up the octave volumes and attenu-
ate the dry signal at the same time, thereby keeping the overall output
more or less the same.
The trick is to play around with the levels by finding a good starting
point on the mix knob, then tweak each octave level to taste and com-
pensate on the mix knob, if needed.
Note: Although the algorithm is very precise and polyphonic, a signal
coming from an electric guitar/bass contains a lot more frequency

T-Rex warranty conditions
T-Rex offers a 2-year warranty on all our products. In the unlikely event of a malfunction,
please contact our technical support at service@t-rex-effects.com before sending us the
product for repair. Read more about warranty conditions at www.t-rex-effects.com/service
About T-Rex
Based in Vejle, Denmark, T-Rex Engineering makes classic and signature effects pedals for the
world’s best musicians. Our approach blends hi-tech innovation with old-world craftsman-
ship – always in the service of killer tone.
EU regulations • Environment protection
T-Rex accepts and follows the regulations and directives issued by the EU. We find these envi-
ronment protecting regulations very good, and we are happy to follow them.
SUBJECT TO CHANGE WITHOUT NOTICE
Input impedance 500 K Ohm
Output impedance 1 K Ohm
Power supply 9/12 VDC .2,1 mm barrel plug .
Current draw @ 9 VDC 130 mA
Max. input signal Vp-p 5.5 Vp-p
Battery type / Battery life 9 V battery / 1-3 hours (Alkaline)
External connectors Input jack, Output jack, 9 VDC jack
Controls On/Off, Mix, Hi oct A, Hi oct B,
Lo oct A, Lo oct B, A/B Switch
Pedal size incl. knobs (W x H x D) 100 x 55 x 120 mm / 3.9 x 2.2 x 4.7 in
Weight (excl. battery &packaging) 0,315 kg / 11.1 oz
TECHNICAL SPECS