Kurzweil K2600 Musician's Manual page 523

DSP Functions
The DSP Functions
Since these waveform functions generate an output signal only, and donÕt receive an input
signal to pass along, the algorithms are arranged so you wonÕt inadvertently assign a series of
waveforms that interfere with each other. YouÕll usually Þnd, for example, that if you can assign
a waveform in the F1 block, all subsequent blocks will allow you to assign only the added
waveforms. Or, if the subsequent blocks allow you to assign the ÒregularÓ waveforms, itÕs
because the wiring of the algorithm is split so that the two waveforms pass through in parallel
(as in Algorithm 10).
This next point is a small one, but important, and may make it easier for you to understand the
way the waveform functions operate, especially if youÕve been carefully studying the wiring
paths of the algorithms. In several algorithms where the waveforms are available the wiring
paths of the algorithms (the horizontal arrows) appear to send a signal to an input of the
waveforms. This is not the case, and anywhere one of these waveforms is assigned, you should
view the algorithm as if there were no horizontal arrow pointing to the left (input) side of the
block where the waveform is assigned. The diagrams below will clarify this point. The only
difference in the DSP function assignments is in the F1 block, where the Þrst and second
diagrams show the SAW waveform, and the third diagram shows the SAW+ added waveform
(described in the next section). In the Þrst diagram, the PITCH functionÕs output (passing the
sample signal from the keymap) appears to be connected to the input of the F1 block (the SAW
function), as well as splitting and passing to the +GAIN function in the F2 block. This is what
you would see on the ALG page.
In fact, the actual signal path does not pass from the PITCH function through the SAW function;
it splits and bypasses the SAW function, as shown in the second diagram. The third diagram
shows the same algorithm with the SAW+ added waveform assigned to the F1 block. In this
case, the diagram is accurate; the signal passes from the output of the PITCH function, and splits
into a two-wire signal. The upper wire passes through the F1 block where the sawtooth wave is
added, and into the +GAIN function in the F2 block. The lower wire bypasses the F1 block, and
passes directly to the F2 block, where it is combined with the upper wire signal.
Algorithm|24|||||||||||||||||||||||||||||
errR®rrterrR®rrtYrrR®rrterrR®rrtYrrR®rrty
dPITCH|jkSAW|||u:+GAIN|gkPANNERG;AMP|||GH
cvvvvvvm,......M/vvvvvvbcvvvvvvbNvvvvvvbn
Algorithm|24|||||||||||||||||||||||||||||
errR®rrterrR®rrtYrrR®rrterrR®rrtYrrR®rrty
dPITCH|jdSAW|||u:+GAIN|gkPANNERG;AMP|||GH
cvvvvvvm,......M/vvvvvvbcvvvvvvbNvvvvvvbn
Algorithm|24|||||||||||||||||||||||||||||
errR®rrterrR®rrtYrrR®rrterrR®rrtYrrR®rrty
dPITCH|jkSAW+||u:+GAIN|gkPANNERG;AMP|||GH
cvvvvvvm,......M/vvvvvvbcvvvvvvbNvvvvvvbn
Figure 16-4 Understanding Waveform Wiring
The six waveforms in this category are Sine, Sawtooth, Square, Low Frequency Sine, Low
Frequency Sawtooth, and Low Frequency Square. The control-input pages for all six waveforms
affect the pitch of the waveforms. The control-input pages for the Þrst three waveforms are
identical, as are the control-input pages for the three low frequency waveforms are identical.
16-39