title: How to Input / Output sound in Android?
body: <p>I want to build a software which takes audio signals (from electric guitar jack cable) and transmits them to audio output.</p>
  
  <p>At first, I guess I should make a program that transmits the sound, without changing it, to the output. And I guess this involves a Jack-To-USB adapter.</p>
  
  <p>My aim is to change the signal, like its pitch, gain etc.</p>
  
  <p>Any ideas how to do such a thing?</p>
  
  <p>Thanks for any help :)</p>
  
  <h2>P.S.</h2>
  
  <p>I mean live. The signal should be transmitted as soon as it is received from the USB input.</p>