====== FILTER ======

[c64] [c128] [m65]

Selects various sound filter properties.

===== Syntax =====

<code xcbasic>
FILTER [<sid_number>] <subcmd> [<subcmd> ...]
</code>

  * ''<sid_number>'' is optional and defines on which SID chip the filter values should be set. If it isn't provided, it defaults to 1. This parameter is useful on multi-SID systems, for example a [c64] equipped with two SID chips, or the [m65] that has four SID chips. The number must be between 1 and 4.
  * ''<subcmd>'' is one of:
    * ''CUTOFF <cutoff_freq>'' - Filter cutoff frequency, a value between 0-2047
    * ''RESONANCE <value>'' - Filter resonance setting, a value between 0-15 
    * ''LOW|BAND|HIGH PASS''

<adm note>
Refer to the [[http://archive.6502.org/datasheets/mos_6581_sid.pdf|SID Data Sheet]] for explanation of all filter settings.
</adm>
===== Example =====

<code xcbasic>
FILTER CUTOFF 900 RESONANCE 7 LOW PASS
</code>

The filter can be applied to a particular voice using the [[VOICE]] command.

===== See also =====

  * [[SOUND_CLEAR]]
  * [[VOICE]]
  * [[VOLUME]]