Source Audio Soundblox Pro Poly-Mod Filter Control Supplement User Manual

BACK PAGE EXPRESSION PEDAL CONTROLS OF THE
SOUNDBLOX PRO POLY-MOD FILTER

Summary

The following information digs deeper into the ‘Back Page Parameters’ of the Soundblox Pro
Poly-Mod Filter specifically relating to an expression pedal. The Poly-Mod Pro boasts an
incredible variety of functions that can are most completely explored with a full understanding of
these controls. They are divided into two categories: ‘XD’ for Expression Pedal Depth, which
controls the range of an expression pedal and ‘XC’ for Expression Pedal Control, which controls
the parameter assignment of an expression pedal.

Expression Pedal Depth (XD)

The ‘XD’ marker located on the leftmost side of the graphic EQ signifies the Expression Depth
function. This can be used to modify the range or depth of a third-party expression pedal
connected to the Poly-Mod Pro. There are a total of 25 possible ‘XD’ selections between -12 and
+12 with 5 levels in between each level indicated by a single LED being lit.

A single light in the +12 position denotes the maximum depth of positive value.

A single light in the -12 position denotes the maximum depth of negative value.

A single light in the ‘0’ position is a neutral selection that effectively disables the expression input.

Expression Pedal Control (XC)

The ‘XC’ marker located second from the left above the graphic EQ signifies the Expression
Control function. This can be used to select the input destination of a third-party expression
pedal or the LFO. Any of the four control knobs (Frequency, Sweep Range, Speed, and Mix)
may be a destination. Filter modulation and the effect selector knob are also available
destinations.

When paired, the knobs remain active with the expression pedal signal summed with the knob
position. This sum value is pinned to stay within the full control range of the knobs alone. To
enable control of the entire range of a knob with an expression pedal, it is important to set the
destination knob to the full counter-clockwise position. Otherwise, the value will pin and some of
the physical range of the expression pedal will not have any effect.

It is important to note that the signal from the expression pedal is identical to the action of turning
each knob. The range and direction of the expression pedal is dictated by the ‘XD’ parameter.
When ‘XD’ is set to a parameter above the neutral ‘0’ position (towards +12), moving the
expression pedal forward will be like turning the destination knob clockwise. When ‘XD’ is set to
a parameter below the neutral ‘0’ position (towards -12), moving the expression pedal forward will
be like turning the destination knob counter-clockwise.

For example, in the case of the Sweep Range knob, this means that rocking the expression pedal
forward while the knob is set to its full counter-clockwise position may pass the signal from
maximum negative sweep through zero modulation to maximum positive sweep.

For split function knobs such as Sweep Range, it is advisable to set the destination knob to 12
o’clock and set the ‘XD’ parameter to half of its maximum positive (+6) or negative (-6) so that the
full range of the expression corresponds to the full range of one function.

For single function knobs such as Frequency, it is advisable to set the destination knob to it’s full
counter-clockwise position and set the ‘XD’ parameter to its maximum positive (+12) so that the
full range of the expression pedal corresponds to the full range of the knob.

There are 13 possible ‘XC’ selections. Starting from the bottom (-12), they are: