output [channel] compressor

$ minidsp output 0 compressor --help
minidsp-output-compressor 
Control the compressor

USAGE:
    minidsp output <output-index> compressor [OPTIONS]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -a, --attack <attack>          Sets the attack time in ms
    -b, --bypass <bypass>          Bypasses the compressor (on | off)
    -k, --ratio <ratio>            Sets the ratio
    -r, --release <release>        Sets the release time in ms
    -t, --threshold <threshold>    Sets the threshold in dBFS