Basic Sound Parameters
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DYN-TVF (Dynamic Time-Variant Filter)
Basically the same as TVF, but with an additional parameter called Dyn (touch the Cutoff tab to see this) which applies Cutoff modulation
from the audio-envelope of oscillator 2 (or from the inputs when oscillator 2 Type is EXT IN). See ENV RING in “The Mod Section” above!
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COMP (Compressor)
Compress Tom
Compression is the audio-engineer’s “secret weapon” used to manipulate several
attributes of pre-recorded sound. For instance, it can add punch to a drum...
Restore 512:INIT PATCH, select PCM for oscillator 1, with Waveform 239 “RockTom
Lo”. Listen to this sound for a while, then go to COSM1 and select COMP . Take both
Attack and Sustain up to 70 and the Output Level down to 105 so that the
volume is about the same whether or not the compressor is active. Now compare the
original with the treated sound by repeatedly touching the ON button . Note that
compression can also accentuate the ambient tail of a sound: Play a note and hold it...
The compressor in the COSM section is fairly simple (with only two main parameters - Attack
and Sustain), but like all COSM algorithms, it is polyphonic. For a more typical and flexible
stereo compressor, see MFX number 09 (Dynamic Processor) in the Effect section.
TVF (Time-Variant Filter)
A variation on the standard filter you will find on any subtractive synthesizer, but with a
total of 12 different types:
LPF Low Pass Filter. Removes frequencies above the Cutoff point.
BPF Band Pass Filter. Removes frequencies above and below the Cutoff point.
HPF
High Pass Filter. Removes frequencies below the Cutoff point. 3 different slopes.
NOTCH
Often called Band Reject or Band Stop. Removes frequencies around the Cutoff point.
PEAK Accentuates frequencies around the Cutoff point.
That was only five, but each of these types are available with different slopes (dB per
octave). For an easy example of what to do with a Lowpass filter, see the section
“The Simplest of Patches” above.
DUAL (Dual Filter)
Similar to the standard TVF (see below), but with two 12dB/octave filters, either in
parallel or in series. The filters can be routed in three different ways: parallel LowPass /
HighPass, serial LowPass
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HighPass, and parallel BandPass / BandPass.
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