Type (FILTER TYPE)
[Polysix, MS-20 LP, MS-20 HP, 2-pole LP, 2-pole HP, 2-pole BP, 2-pole BR, 4-pole LP, 4-pole HP, 4-pole BP, 4-pole BR,
Multi Filter]
Pressing the front panel FILTER TYPE button selects and edits the Type parameter. Three useful settings are available directly: the Polysix LP, the MS-20 LP, and the Multi Filter. Many more types are available by editing the on-screen parameter. If in doing so you select one of the three types listed on the front panel, the front-panel FILTER TYPE LEDs will update to show the selection. Selecting any other Filter Type lights the MORE LED. If you switch between Types from the front-panel button, the MORE position remembers the last-used “more” Type.
LP (Low Pass). This cuts out the parts of the sound which are higher than the cutoff frequency. Low Pass is the most common type of filter, and is used to make bright timbres sound darker.
HP (High Pass). This cuts out the parts of the sound which are lower than the cutoff frequency. You can use this to make timbres sound thinner or more buzzy.
BP (Band Pass). This cuts out all parts of the sound, both highs and lows, except for the region around the cutoff frequency. Since this filter cuts out both high and low frequencies, its effect can change dramatically depending on the cutoff setting and the oscillator’s multisample.
With low resonance settings, you can use the Band Pass filter to create telephone or vintage phonograph sounds. With higher resonance settings, it can create buzzy or nasal timbres. BR (Band Reject). This filter type–also called a notch filter– cuts only the parts of the sound directly around the cutoff frequency. Try modulating the cutoff with an LFO to create phaser-like effects.
2-pole LP, HP, BP, and BR: These produce 12dB/octave slopes for LP and HP, and 6dB/octave for BP and BR. A classic synthesizer expander module used this type of filter.
4-pole LP, HP, BP, and BR: These produce 24dB/octave slopes
for LFP and HP, and 12dB/octave for BP and BR. In
comparison to 2-pole filters, these create a sharper roll-off
beyond the cutoff frequency with more delicate resonance.
Many classic analog synths used this general type of filter.
Multi Filter. This is a complex filter which is capable of all of the 2-pole filter types, and many more besides. See “Multi Filter,” on page 54.
Resonance) Bass
[Full, Tight]
This is available only when Type is one of the 2-pole Resonant or 4-pole Resonant settings, or Multi Filter. Resonance Bass controls the character of the filter resonance at low cutoff frequencies. Its effect is most noticeable with high Resonance settings.
Tight produces a more restrained resonance, similar to a classic, American, wood-paneled monophonic synthesizer(Minimoog)Full produces a wide, boomy resonance, reminiscent of a famous five-voice American synthesizer.(Prophet 5)
4-Pole LP/HP/BP/BR
Resonance Type
[Standard, High]
Resonance Type is available only when using one of the 4-pole filters. Standard provides the resonance character of a typical analog 4-pole filter. High creates a more pronounced resonance.
MS-20 LP/HP and Polysix
Gain
[Loud, Less Resonance; Unity, Less Resonance; Normal, 1-osc input; Normal, 2-osc input]
Gain is available only when Type is MS-20 LP, MS-20 HP, or Polysix. These filter types include saturation, which interacts with resonance. With anything other than very low resonance settings, input volume can have a strong effect on their character. The lower the input gain, the more headroom remains for the resonance to bloom. Use Gain to set the basic input level, and then fine-tune with Trim if desired.
Filter
Normal, 2-osc input: This is the lowest input gain. It will produce the classic resonant sounds of these filters even with two oscillators playing at full volume. If you’re using the Sub Oscillator as well, and want to retain the full volume of the resonance effect, you may wish to use Trim to further reduce the input gain.
Normal, 1-osc input: This will produce the classic resonant sounds of these filters with a single oscillator playing at full volume. When input is louder than a single full-volume oscillator, the resonance effect will be less pronounced. Unity, Less Resonance: Volume is unattenuated. This leaves less headroom, so resonance will be less prominent.
Loud, Less Resonance: This provides a slight volume boost on input. This makes it easy to reach saturation with the input level alone, leaving very little headroom for resonance.
Multi Filter
Xfd (XFADE)
[0...100]
This is available only when Type is Multi Filter. XFADE (crossfade) morphs between the Mode 1 and Mode 2 settings. 0 is all Mode 1, 100 is all Mode 2, and 1-99 are intermediate values between the two Modes. Control this from the front panel using SHIFT-ENV INTENSITY.
MFilt (Multi Filter Preset) (PRESET)
[List of Presets]
This is available only when Type is Multi Filter. Presets let you quickly select from a number of useful combinations of Modes 1 and 2. Choose presets from the front panel using SHIFT-RESONANCE. You can also select any combination you wish on the Multi Filter page, described below.
Multi Filter
This page is available only when the Filter page Type is set to Multi Filter.
Filter
What’s a Multi Filter?
Standard multimode filters generate low-pass, high-pass, and band-pass filters simultaneously—but only let you use one of them at a time. The Multi Filter gives you access to all three filter modes simultaneously, in any combination, along with the dry input signal. You can choose from a large number of preset combinations, or create your own complex filter modes using the Manual controls.
This is capable of some cool sounds in and of itself, but things really get interesting when you use XFADE (see “Xfd (XFADE)” on page 54). XFADE allows you to mix between two of these filter settings (Mode 1 and Mode 2), using modulation sources such as envelopes, LFOs, or real-time controllers.
1 (Mode 1)
[List of filter types]
This sets the filter type for Mode 1.
Low Pass, High Pass, Band Pass, and Band Reject are the standard filter types. For more information, see “Filter,” on page 51.
LP+BP, LP-BP, LP-HP, BP+HP, BP-HP, Dry+LP, Dry-LP, Dry+BP, Dry-BP, Dry+LP-HP, Dry+LP-BP, Dry+BP-LP, Dry+BP-HP, Dry+HP-LP, Dry+HP-BP, LP+HP+BP: These combine two or more filters at equal volumes. Dry is the un-filtered input signal. The minus sign (“-”) indicates when the phase of a filter is reversed.
All On uses the Low Pass, High Pass, Band Pass, and Dry signals at equal volumes.
Manual lets you create your own mix of the filters; an additional four parameters will appear. For more information, see “Manual,” below.
2 (Mode 2)
Mode 2 has the same selections as Mode 1.
Manual
When Mode is set to Manual, these parameters let you create your own mix of the filters.
You may wonder why Band Reject is not included here. This is because it’s not a filter mode per se. Instead, it’s created by equal amounts of High Pass and Low Pass. Try it and see!
LP (Lowpass), HP (Highpass), BP (Bandpass), Dry
[-100%...+100%]
These set the volume of the Lowpass, Highpass, Bandpass, and Dry signals, respectively. Negative values invert the