Kurzweil K2500 Reference Manual page 76

Configurable Combination Algorithms [Ò<>Ó]
Individual Effect Components
Configurable Chorus and Flange:
The configurable chorus and flange have 2 moving delay taps per channel. Parameters associated with chorus
control begin with ÒChÓ in the parameter name, and those associated with flange begin with ÒFlÓ. General
descriptions of chorus and flange functionality can be found in the Chorus (FXAlg #150) or Flange (FXAlg #154)
sections of this book.
Since these effects have 2 taps per channel, control over four LFOs is necessary with a minimum number of user
parameters (Fig. 1). This is accomplished by offering two sets of LFO controls with three user interface modes:
Dual1Tap, Link1Tap, or Link2Tap. These are selectable with the LFO cfg parameter and affect the functionality of
the two sets of rate, depth and delay controls (and also phase and feedback controls for the flange). Each parameter
is labeled with a 1 or a 2 in the parameter name to indicate to which control set it belongs. Control set 1 consists of
controls whose name ends with a 1, and control set 2 consists of controls whose name ends with a 2.
Left
LFO1L
LFO2R
Fig. 1 Ñ LFO delay taps in the configurable chorus and flange Fig. 2 Ñ LFO control in Dual1Tap mode
In Dual1Tap mode (Fig. 2), each control set independently controls one tap in each channel. This is useful for dual
mono applications where separate control over left and right channels is desired. Control set 1 controls the left
channel, and control set 2 controls the right channel. The second pair of moving delay taps are disabled in this mode.
LRPhase is unpredictable unless both rates are set to the same speed. Then, the phase value is accurate only after
the LFOs are reset. LFOs can be reset by either changing the LFO cfg parameter, or loading in the algorithm by
selecting a preset or studio that uses it. For user-friendly LRPhase control, use either the Link1Tap or Link2Tap
modes.
In Link1Tap mode (Fig. 3), control set 1 controls 1 tap in both the left and right channels. Control set 2 has no effect,
and the second pair of LFO delay taps are disabled. This mode is optimized for an accurate LRPhase relationship
between the left and right LFOs.
In Link2Tap mode (Fig. 4), control set 1 controls the first left and right pair of LFOs, while control set 2 controls the
second pair. This mode uses all 4 LFOs for a richer sound, and is optimized for LRPhase relationships. Each of the
2 taps per channel are summed together at the output, and the Fdbk parameters control the sum of both LFO taps
on each channel fed back to the input.
Algorithm Reference-76
Right
LFO1R
LFO2L
Left
Contro l Set 1 Control Set 2
LFOL LFO R
Right