performous --mics channels=2@alsa:hw:Audigy2,1

desputin@kdegroszerrechner:~$ performous --michelp
Performous 0.5.1
ALSA capture devices:
  alsa:hw:Audigy2,0   SB Audigy 4 [SB0610] (ADC Capture/Standard PCM Playback)
  alsa:hw:Audigy2,1   SB Audigy 4 [SB0610] (Mic Capture)
  alsa:hw:Audigy2,2   SB Audigy 4 [SB0610] (Multichannel Capture/PT Playback)
  alsa:hw:SB,0   HDA ATI SB (ALC889 Analog)
  alsa:hw:SB,1   HDA ATI SB (ALC889 Digital)
  alsa:hw:SB,2   HDA ATI SB (ALC889 Analog)
  alsa:hw:i2000AF,0   iSlim 2000AF (USB Audio)
ALSA playback devices:
  alsa:hw:Audigy2,0   SB Audigy 4 [SB0610] (ADC Capture/Standard PCM Playback)
  alsa:hw:Audigy2,2   SB Audigy 4 [SB0610] (Multichannel Capture/PT Playback)
  alsa:hw:Audigy2,3   SB Audigy 4 [SB0610] (Multichannel Playback)
  alsa:hw:SB,0   HDA ATI SB (ALC889 Analog)
  alsa:hw:SB,1   HDA ATI SB (ALC889 Digital)
  alsa:hw:NVidia,3   HDA NVidia (HDMI 0)
  alsa:hw:NVidia,7   HDA NVidia (HDMI 0)
  alsa:hw:NVidia,8   HDA NVidia (HDMI 0)
  alsa:hw:NVidia,9   HDA NVidia (HDMI 0)

Specify with --mics [OPTIONS@]dev[:settings]]. For example:
  --mics channels=2                 Two mics on any sound device
  --mics channels=2@jack            Two mics on JACK
  --mics channels=18@alsa:hw:M16DX  18 input channels on ALSA device "hw:M16DX"
                                    Note: only the first four at most will be used
  --mics channels=1,rate=44100      One mic; will try to get 44100 Hz if available

Multiple --mics options may be specified and all the successfully opened inputs
are assigned as players until the maximum of four players are configured.

Capture devices available:
  alsa    ALSA PCM capture. Device string can be given as settings (default is "default").
  gst     GStreamer PCM capture. Settings are not used.
  jack    JACK PCM input. JACK client name may be given as settings (default is "libda_jack_record").
  pa19    PortAudio v19 PCM capture. Device number as settings (otherwise PA default).
  pulse   PulseAudio capture. Client (application) name can be given as settings.
  none    No device. Will not receive any audio data.