# Multichannel Audio

So far, in terms of sound production, we’ve explored triggering synths and recorded sounds via the fns `play`, `synth` and `sample`. These have then generated audio which has played through our stereo speaker system. However, many computers also have the ability to input sound, perhaps through a microphone, in addition to the ability to send sound out to more than two speakers. Often, this capability is made possible through the use of an external sound card - these are available for all platforms. In this section of the tutorial we’ll take a look at how we can take advantage of these external sound cards and effortlessly work with multiple channels of audio in and out of Sonic Pi.