Update c64.md

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@ -24,7 +24,7 @@ the C64 instrument editor consists of two tabs: "C64" to control various paramet
- **low**: a low-pass filter. the lower the cutoff, the darker the sound.
- **high**: a high-pass filter. higher cutoff values result in a less "bassy" sound.
- **band**: a band-pass filter. cutoff determines which part of the sound is heard (from bass to treble).
- **ch3off**: mutes channel 3 when enabled. It was originally planned for usage with two registers where program could read current oscillator and envelope outputs, thus making vibrato and SFX generation easier. But who wanted to sacrifice one channel out of three! So aforementioned was just done in software, and the feature was never used.
- **ch3off**: mutes channel 3 when enabled. It was originally planned for usage with two registers where program could read current oscillator and envelope outputs, thus making vibrato and SFX generation easier. but who wanted to sacrifice one channel out of three! so aforementioned was just done in software, and the feature was never used.
- multiple filter modes can be selected simultaneously. for example, selecting both "low" and "high" results in a bandstop (notch) filter.
- **Absolute Cutoff Macro**: when enabled, the cutoff macro will go from 0 to 2047, and it will be absolute (in other words, control the cutoff directly rather than being relative).