You can use following command line parameters

/input <FileName> /output <folder> /dest <dest> /createfullpath /p n /additional_parameters

where:

/input                 - input file name (supports wildcards * ?)
/output                - output folder name
/createfullpath        - same as check box, false by default
/dest                  - destination format, one from mp3,wma,ogg,ape,flac,wavpack,wav
/p                     - specify number of parallel files
/q                     - do not show any error (be quiet)
/additional_parameters - output format specific parameters:

!!! For your information !!!
Names for command line parameters are not case sensitive

for mp3 you can specify:
    /Bitrate    - if this one is specifier, CBR will be used
    /MinBitrate - if this and next one is specifier, VBR will be used
    /MaxBitrate
    /StereoMode - s|js
    /VBRMethod old|new|abr|default
    /Quality 
    /Preset NORMAL_QUALITY|LOW_QUALITY|HIGH_QUALITY|VOICE_QUALITY|R3MIX|VERYHIGH_QUALITY|STANDARD|
            FAST_STANDARD|EXTREME|FAST_EXTREME|INSANE|ABR|CBR|MEDIUM|FAST_MEDIUM|b320|V0|V1|V2|V3|V4|V5|V6|V7|V8|V9

for wma you can specify:
    /UseProCoder
    /Bitrate
    /Quality
    /Loseless

for ogg you can specify:
    /Quality from 0 - 10, specify either this or parameters below
    /MaxBitrate
    /AvgBitrate
    /MinBitrate

for ape you can specify:
    /Compression fast|normal|high|extra|insane

for flac you can specify:
    /Compression 0 to 8

for wavpack you can specify:
    /Compression fast|high|veryhigh

for wav there are no additional parameters

Samples:

: wildcard as input file, run 2 files in parallel
xrecode /input "D:\mp3\*.mp3" /output "d:\converted\1" /p 2 /dest mp3 /MinBitrate 32 /MaxBitrate 64 /StereoMode S /VBRMethod NEW /Quality 4

: mp3
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1" /dest mp3 /MinBitrate 32 /MaxBitrate 64 /StereoMode S /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\2" /dest mp3 /MinBitrate 64 /MaxBitrate 96 /StereoMode JS /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\3" /dest mp3 /MinBitrate 96 /MaxBitrate 128 /StereoMode S /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\4" /dest mp3 /MinBitrate 128 /MaxBitrate 224 /StereoMode S /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\5" /dest mp3 /MinBitrate 224 /MaxBitrate 320 /StereoMode S /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\6" /dest mp3 /Bitrate 32 /StereoMode S /VBRMethod NEW /Quality 4
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\7" /dest mp3 /Preset INSANE

: wma
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1"  /dest wma /Bitrate 32 

: ogg
recode /input "D:\mp3\test.mp3" /output "d:\converted\1"  /dest ogg /Quality 4

: ape
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1"  /dest ape /Compression insane

: flac
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1" /dest flac /Compression 5

: wavpack
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1" /dest wavpack /Compression 2

: wav
xrecode /input "D:\mp3\test.mp3" /output "d:\converted\1" /dest wav