Source Audio Soundblox Pro Poly-Mod Filter User Manual

Page 24

24 | Backpage Parameters

Octave Extension (OE)
This Backpage parameter offers a choice between a seven or eight band
equalizer. The illumination of the bottom most

LED

signifies the selection

of the factory default

-band

. The illumination of the second

LED

from the bottom signifies the selection of an

-band

. The additional

band is one octave below the lowest band in the default setting

(

62.5

Hertz).

Once the 8-band EQ has been selected and the Backpages mode has
been exited, the additional 62.5 Hz band can be accessed by scrolling the
EQ all the way to the left, then hitting the left arrow button one additional
time. Each frequency band setting will shift one position to the right
opening access to the 62.5 Hz band in the left most column.

Note: This is a global setting and will not be saved per preset.

Volume (VA)
Adjusts the pedal’s final output signal level. It is possible to change the
factory default output level by +/-

12dB

in steps of

dB.

Q (Q)
First, let’s define what

is. In the early days of radio, the sharper the

band-pass filter in the tuner section was, the better the radio could tune
in a desired station and reject other stations at nearby frequencies. So
the sharpness of the filter was termed “quality”, or

Adjusting the

parameter in the Poly-Mod Pro multiplies all the

’s in

the filter definition. Increasing the

’s of the filters results in narrower

and sometimes higher peaks in the frequency response. In general, it
will sound wetter, although it is certainly possible to overdo it—the
highest Q settings are extreme. Notches in the frequency response, how-
ever, will become less evident with higher

’s (because they will become

narrower.). Decreasing

will create a dryer, less effect driven tone.

The center position of the

LED

display represents a value of

1.0

, or no

change to

. Going up to higher values can reach a factor of

. Lower

values go to

.25

. Higher

’s may require a volume reduction on the

Backpage.