The Sosnowski Synthesizer
The Sosnowski Synthesizer is organized in five "rows" from top to bottom. This section covers the third row, which contains the filter, the filter envelope, and the two low frequency oscillators, LFO 1 and LFO 2. Taken together, these controls work with each other as the most versatile method of shaping the sound from the oscillators. Though satisfying and worthwhile sounds can be made without the use of this entire row, in most cases some or all of its parts will be engaged.
One note to allay confusion: In this
section we detail the "filter envelope". Do not confuse the "filter
envelope" (row three) with the "main envelope" (row four), which will be
discussed on a subsequent page. The "filter envelope" controls only how
the settings of the filter itself are applied to the sound; while the "main
envelope" is a final stage, that shapes the overall sound.
|At the top left of the filter section, a button switch enables or disables
the filter. Note that this switch enables or disables all elements of the row, including the
LFO's. If the button is off (gray with a minus sign), the filter envelope and LFO's
are likewise off and do not influence the sound. If the switch is on (glowing bright
green), then the filter envelope is available and active in the sound; and the LFO's are
likewise available. (Assuming the filter row is on, the LFO's can be independently
switched on and off, of course.)
The Filter Controls:
At the top left of the filter section is a drop-down menu selector to choose the type of filter (labeled "filter type"). There are five types of filter: Low Pass, High Pass, Band Pass, Band Reject, and Peaking. The different filter types work as follows:
Below the filter type selector are three knobs labeled "cut-off" (the cut-off frequency setting); "res" (the resonance); and "track" (the tracking). The function of each is as follows:
In most sounds, the regulation of these three controls, most especially cut-off, merits
careful and considered attention, as they are crucial to the color and response of the
The Filter Envelope
|There are five control knobs in the filter envelope: attack, decay, sust
(sustain), release, and amount. The functions of these settings are as follows:
As noted in the header of this section, it's important to remember that the filter
envelope applies to the behavior of the filter, shaping its influence on the
underlying sound across time. This is quite different from, and separate from, the
Main Envelope, which shapes the amplitude envelope of the whole sound.
|The filter row contains two LFO's (low frequency oscillators). The
LFO's modulate the behavior of the filter by moving the cut-off frequency in proportion to
the amplitude of the LFO output.
The two LFO's are identical, but completely independent of each other. When the filter row is active, each LFO can be turned on or off with the button switch in its upper left. When the LFO is engaged, the button glows bright green. When the LFO is off, the button is gray with a minus sign, and the LFO does not influence the filter.
The LFO controls are as follows:
|<- Row 2 :: Row 4 ->|