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Appendix 3-
Filter Types
Table 29 shows the filter types available in Solaris.
LP = Lowpass, HP = Highpass, BP = Bandpass, BR = Band Reject (Notch), AP = Allpass.
The numbers describe the pole count for each, a pole providing 6 dB of filtering. There are several series
filter combinations.
Type
Description
MM1 (Multimode)
23 filter variations are selectable. The 24 dB Lowpass (LP4) is very similar to the CEM LP filter of the Rev
3 Prophet 5s. Available modes include: LP4, LP3, LP2, LP1, HP4, HP3, HP2, HP1, BP4, BP2, BP2+LP1,
BP2+LP2, BP2+HP1, BP2+HP2, BR4, BR2, BR2+LP1, BR2+LP2, BR2+HP1, BR2+HP2, AP3, AP3+LP1,
AP3+HP1
SSM
Emulation of the Solid State Music chip used in the Rev.1 and Rev.2 Prophet synths. A 4-pole, 24 dB
slope filter.
Mini
Emulation of the filter used in the Minimoog. A 4-pole, 24 dB slope filter. Input levels easily distort.
Obie
A 2 pole 12 dB state variable filter based on an Oberheim design. Includes: LB, HP, BP, and BR.
Comb
The comb filter adds a delayed copy of a signal to itself, in either a feed-forward or feedback loop. Both
cause interference with the original signal, resulting in a frequency response that looks much like a comb.
Solaris’s comb filter can operate in two modes:
Tube
or
Comb
.
Tube
mode is a feedback loop, which
produced higher levels of resonance, making it better for modelling Karplus-Strong “plucked string” algo-
rithm.
Comb
mode is a feed-forward design. The delay length is limited to onboard chip memory, so this
affects how low the cutoff frequency can go.
Vocal
A format filter with five vowels that can be morphed using the
X-Fade
control.
Table 29. Solaris Filter Types
Содержание Solaris
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