Filter - Sequential prophet 5 User Manual

Filter

The function of the filter is to subtract frequencies from the sound
produced by the oscillators and noise generator, thereby changing the
overall harmonic content of the synth's sound. This change is varied over
time using the Filter Envelope to produce more dynamic timbres.
The original Prophet-5 had three incarnations: the Rev1, Rev2, and Rev3,
each with their own unique characteristics. Probably the most significant
difference between the Rev 1/2 and the Rev3 was that they had different
filters, which gave the instruments a different sound character. The Rev
1/2 had a Dave Rossum-designed 2040 low-pass filter, while the Rev3
had a Doug Curtis-designed CEM 3320 low-pass filter.
The new Prophet-5 provides the best of all worlds by providing both
types of filters. You can select between these with the
has its own unique character:
• 1/2 is a Dave Rossum-designed SSI 2140 filter. Its 4-pole, 24
rev
dB-per-octave resonant design is functionally identical the 2040 filter
found on the original Sequential Circuits Prophet-5 Rev1 and Rev2. It
can self-oscillate when
• 3 is a genuine Doug Curtis-designed CEM 3320 filter. Its 4-pole, 24
rev
dB-per-octave resonant design is functionally identical the filter found
on the Sequential Circuits Prophet-5 Rev3. It can self-oscillate when
resonance
The differences between these filters can be subtle or pronounced, depend-
ing on their individual settings, the amount of filter resonance applied,
and other factors.
The
rev
response to match the original Prophet Rev 1/2 and Rev 3 respectively. After setting
the Filter Envelope as desired, try changing filter type to hear the difference.
22 Filter
resonance
is set to its maximum.
switch not only changes filter type, but also the Filter Envelope's shape/
rev
is set to its maximum.
switch. Each
Sequential