Dave Smith Instruments Temptest - Lowpass

32 Lowpass Dave Smith Instruments
Lowpass
Frequency: 0...164—Sets the lter
cutoff frequency over a range of
more than 13 octaves. This control
steps in semitones when turned
slowly, but smoothly controls the
lter without steps when turned at a
faster rate.
4 Pole: On, Off —Selects the lter conguration. When on, the lter is in 4-pole
mode. A 4-pole, low-pass lter rolls off frequencies above the cutoff frequency at
a slope of -24dB/octave. When off, the lter is in 2-pole mode and has a slope of
-12dB/octave and a more gradual roll-off of the higher frequencies.
Resonance: 0...127 —Emphasizes a narrow band of frequencies around the
cutoff frequency. In 4-pole mode, high levels of resonance can cause the lter to
self oscillate. In 2-pole mode, resonance is much more subtle.
Audio Mod: 0...127 —Controls the amount of audio from oscillator 1 used
to modulate the lter cutoff frequency. For lter-only audio, set 1/2 miX in the
Oscillators section to 0/100, oscillator 2 Shape to Off, and oscillator 1 Shape to
the desired waveshape. This is useful for bell-like FM sounds. A wide range of
sounds can also be made using audio mod with the oscillators routed normally
through the lter.
Key > Freq: 0...127 —Sets the amount of modulation from the note number—
from either the beat, the pads, or via MIDI—to the lter frequency. Sometimes
called key tracking in keyboard synths, because the cutoff frequency “tracks”
notes played on the keyboard. A setting of 64 will step the lter in semitone
increments for each successive note, 32 is quarter tones, and so on.