generic setting
[External compressor:srep]
header = 0
packcmd = srep.exe -m3f -d1g -a2 $$arcdatafile$$.tmp - <stdout>
[External compressor:lolz]
header = 0
packcmd = lolz.exe -mt4 -mtt1 -d64 -fba4096 -mc1023 -pc4 -gm20 -dtb1 -x2 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
[External compressor:xprecomp]
header = 0
packcmd = xtool.exe e

recomp:c256mb,t4:zlib - - <stdin> <stdout>
*as a side note, for lolz change mt to match cpu core and for xtool no need to change cm to smaller number it will make xtool slower during installation beside "BIGGER ALWAYS BETTER"