User guide

7
Nonlinear Waveform Combinaon Modes
The outputs of the two oscillators are sent through a nonlinear combinaon process before going to the echo/
delay eect and then onto output 1. The combinaon process allows the generaon of complex mbres and
interacons between the two oscillators, as shown in the gures on the next two pages.
Press the COMBO MODE buon to acvate the rotary encoder for selecon of the combinaon mode. The
selected combinaon mode will be shown in the boom row of the LCD display. The COMBO MODE parameter
can also be modulated by the MOD B input, which is acvated with a second press of the COMBO MODE but-
ton. When MOD B modulaon is acve the lower row of the LCD display will change to show both the nominal
seng and the oset provided by the MOD B modulaon.
There are 8 dierent combinaon modes that can be selected:
cmb:osc1 - in this mode there is no nonlinear combinaon. The output of oscillator 1 is taken as is.
cmb:ring - in this mode the outputs of oscillator 1 and oscillator 2 are mulplied, equivalent to the well-
known ring modulaon eect.
cmb: min - in this mode either the output of oscillator 1 or the output of oscillator 2 is chosen, depending
on which one has the lower value.
cmb:pong - in this mode the output of oscillator 1 is chosen if it has a posive value, otherwise the output
of oscillator 2 is chosen if it has a negave value. If neither of these condions holds, then the output is
set to 0.
cmb:inlv - in this mode the digital bits represenng the two oscillator waveforms are interleaved to
provide the output of the combinaon process. The most signicant bit of oscillator 1 is used as the most
signicant bit of the output, the 2nd most signicant bit of oscillator 2 is used as the 2nd most signicant
bit of the output, and so forth, alternang between taking bits from oscillator 1 and 2.
cmb: and - in this mode the digital bits represenng the two oscillator waveforms are combined using the
logical AND operaon (the AND operaon produces a 1 bit when both the input bits are 1, otherwise it
produces a 0 result).
cmb: xor - in this mode the digital bits represenng the two oscillator waveforms are combined using the
logical XOR operaon (the XOR operaon produces a 0 bit when the input bits have the same value, oth-
erwise when the bits have dierent values it produces a 1 result).
cmb:gLcH - in this mode each bit of the output of the combinaon process is set to 1 whenever the re-
specve bits of oscillator 1 and 2 both become 1, and is set to 0 whenever the respecve bits of oscillator
1 and 2 both become 0. Otherwise the bits hold their value constant. Whenever the 2nd most signicant
bit of the combinaon goes from 0 to 1, the phase of oscillator 1 is ‘bumped’, or oset, by a step of 1/4
cycle (or 90 degrees of phase) and the phase of oscillator 2 is bumped by a step of 1/8 cycle (or 45 de-
grees of phase). The overall eect of this rather complicated combinaon is to provide a noisy and glitchy
sound.