# Commodore Amiga a computer with a desktop OS, lifelike graphics and 4 channels of PCM sound in 1985? no way! in this very computer music trackers were born... imported MOD files use this chip, and will set A-4 tuning to 436. # effects - `10xx`: **toggle low-pass filter.** `0` turns it off and `1` turns it on. - `11xx`: **toggle amplitude modulation with the next channel.** - does not work on the last channel. - `12xx`: **toggle period (frequency) modulation with the next channel.** - does not work on the last channel. - `13xx`: **change wave.** - only works when "Mode" is set to "Wavetable" in the instrument.