Amplitude And Filter Parameters; The Effects; Control With After Touch And Modulation Wheel - KETRON SD1 User Manual

cian with the SD1. The coarse sound of the wave form is processed with an envelope on the amplitude, namely a function that is used to "draw"
the trend of the sound volume while a note is played. There are different types of envelope: that used by the SD1 is made up of four segments
split up into Attack (the time the sound takes to reach the maximum level), Decay (the time that the sound takes to drop from maximum level
to that established by the Sustain), Sustain (the level at which the sound remains until the note played is released), and Release (the time the
sound takes to drop from the Sustain level to Zero level). This type of envelope is also called ADSR. Together with the control of the amplitude
the SD1 enables the musician to modify the harmonies of the sound with a filter that literally cuts-off the frequencies above a point, the so-
called cut-off. The frequencies near the cut-off point can be enhanced with the Resonance, to create those classic sweeps that are typical of
analogue synthesizers and thus often heard in dance. Again from the programming page the user can establish the effect and Reverb entity
that will be used by that timbre and can modify the control exerted by the after touch and the modulation wheel on some timbre parameters.
Amongst these is also the LFO (Low Frequency Oscillator) that is required to create tremolo effects when it is applied on the amplitude (DCA),
and vibrato effects when it is applied on the pitch (DCO) and finally modulation effects on the filter when applied on DCF.

AMPLITUDE AND FILTER PARAMETERS

The programming parameters can all be accessed from the Edit Voice menu using function push buttons F8, F9 and F10 and using the CURSOR
+/- and VALUE +/- push buttons to move around and enter the values of the parameters. Below is a detailed description of the parameters.
F1 Attack This establishes the value of the Attack segment that can be modified using the VALUE +/- push buttons.
F2 Decay: This establishes the value of the Decay segment that can be modified using the VALUE +/- push buttons.
F3 Sustain: This establishes the value of the Sustain segment that can be modified using the VALUE +/- push buttons.
F4 Release: This establishes the value of the Release segment that can be modified using the VALUE +/- push buttons.
F5 Level: This establishes the value of the total volume of the timbre that can be modified using the VALUE +/- push buttons.
To simplify programming of the envelope, the display also shows a graph, the segments of which change proportionally with the values set for
the ADSR.
F6 Resonance: This establishes the Resonance value that can be modified using the VALUE +/- push buttons.
F6 Cut Off: This establishes the cut-off point value of the low pass filter that can be modified using the VALUE +/- push buttons.

THE EFFECTS

Using F8 Effect the musician can access the Sends for the Reverb and Chorus effects. Press F7 Effect to display the level of the Reverb, an
always present effect (unless it is set at zero) and the multi-effect that can be disabled (Off). To access these parameters use the CURSOR +/-
and VALUE +/- push buttons.
As for the multi-effects, once the algorithm has been enabled and selected, one or a number of parameters appear right under the Reverb, which
are used to establish the entity of the single effects of the multi-effects exploited by the timbre. For further information see the Effects section.

CONTROL WITH AFTER TOUCH AND MODULATION WHEEL

Press F9 After touch Wheel and the display will show a 3-column table in which the first indicates the parameter, the second the enabling sta-
tus of the After touch and the third the enabling status for the Modulation Wheel. As you will notice not all parameters can be controlled at the
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Owner's Manual SD1