[alsa-devel] Help required regarding Capture & palyback code for ALSA

Hii I m new to ALSA programming .. i have follow the Guide "Introduction to Sound Programming with ALSA" to make code for capture & playback.when i have compiled the code for capture i dont know from where to give the input. in the Guide it is written that "If you have a microphone connected to your sound card, use a mixer program to set the recording source and level. Alternatively, you can run a CD player program and set the recording source to CD. Try running Listing 4 and redirecting the output to a file" i dont know how to use the mixer program .. but I dont know how to do it to capture some input given by me & playback it ..

thanx & Regrads