Kurzweil K2661, Musician’S Reference Manual

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KDFX Reference
KDFX Algorithm Specifications
10-33
133 8-Tap Delay
134 8-Tap Delay BPM
A stereo eight tap delay with cross-coupled feedback
PAUs: 2
This is a simple stereo 8 tap delay algorithm with delay lengths de fi ned in milliseconds (ms). The left and
right channels are fully symmetric (all controls affect both channels). The duration of each stereo delay tap
(length of the delay) and the signal level from each stereo tap may be set. Prior to output each delay tap
passes through a level and left-right balance control. Pairs of stereo taps are tied together with balance
controls acting with opposite left-right sense. The taps are summed and added to the dry input signal
throught a Wet/Dry control. The delayed signal from the “Loop” tap may be fed back to the delay input.
The sum of the input signal and the feedback signal may be mixed or swapped with the input/feedback
signal from the other channel (cross-coupling). When used with feedback, cross-coupling can achieve a
ping-pong effect between the left and right channels.
Figure 10-8 Left Channel of 8-Tap Delay
The delay length for any given tap is the sum of the coarse and fi ne parameters for the tap multiplied by
the DelayScale parameter which is common to all taps. The DelayScale parameter allows you to change
the lengths of all the taps together.
A repetitive loop delay is created by turning up the Fdbk Level parameter. Only the Loop tap is fed back to
the input of the delay, so this is the tap which controls the loop rate. Usually you will want the Loop delay
length to be longer than the other tap lengths. Set the Loop delay length to the desired length then set the
other taps to
fi ll in the measure with interesting rhythmical patterns. Setting tap levels allows some
“beats” to receive different emphasis than others. The delay lengths for 8-Tap Delay are in units of
milliseconds (ms). If you want to base delay lengths on tempo, then the 8-Tap Delay BPM algorithm may
be more convenient.
The feedback (Fdbk Level) controls how long a sound in the delay line takes to die out. At 100% feedback,
your sound will be repeated inde
fi nitely. HF Damping selectively removes high frequency content from
your delayed signal and will also cause your sound to eventually disappear.
The Hold parameter is a switch which controls signal routing. When turned on, Hold will play whatever
signal is in the delay line inde
fi nitely. Hold overrides the feedback parameter and prevents any incoming
L Input
& Balance
L Output
Top Levels
Dry
Wet
Feedback
Delay
High Freq
Damping
From Right
Channel
To Right
Channel