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Filters
Filters can alter the tone of a note by allowing only a certain range of
frequencies to pass through. TMS allows you to define 4 filters to be used
with the set of 15 envelopes. However, the CBM64 sound hardware only
lets you use one filter for all three voices. You may set the filter number off,
or select one of the four filters available. The filter number device displays
the current filter that can be used by the sequencer.
A filter is defined in a similar way to an envelope. There are three main
parameters: filter type, resonance and filter frequency. A DRE may be used
to sweep the frequency. The filter devices are popped up by pressing
F
or
accessing Commands:
Filter up
. They are then included in the normal
circuit. These devices are popped down in the same way.
The filter frequency DRE can only be popped up when the filter devices are
displayed. Otherwise the pitch/pulse width DRE is displayed. The filter type
device allows you to select one of the four available filter types. They are
identified by an icon and a letter.
-6
16
12
5
0
10
DRE section repeats until end of note duration
F
Pop filter up/down
low pass
band pass
high pass
notch
L
B
H
N