My friend has this 4-track software on his iphone that also lets you do very basic mixing on the phone - you can obviously also transfer the recording to your PC to work on it too. He can even hook up a higher quality microphone to the USB port on his phone to get a better recording. He uses is to get halfway decent sounding reference recordings of us at band practice. Is there anything remotely similar on the Android? If not, would I at least be able to buy a USB mic and use that to record instead of my phone's built in mic? Thanks!