I am a musician and have been writing music for years, now i want to record my own demos. I have envisioned using either a computer or a small external recording device (4 track/ 8 track). All I want to do is create demo mp3's that sound good and can be posted to the web. Any advice to offer? I need some help with computer programs or recording devices, mics, headphones, mic/guitar to computer connections, everything/anything else.