Howdy y'all!
(Seemed an appropriate salutation given the title.... ahem.)
Audacity is a free sound editing platform. It's VERY basic, just allowing for pitch change/time change, cutting/pasting, basic effects (reverb, delay, distortion, etc.), and generating static sin/saw/square tones and the like. I can't input pitches of a given sound as with most DAW's.
I found a tool that allows me to input numbers and it returns the corresponding dial "beep" a-la telephone. I generated some saw tones and worked them into a bassline, then put some electric guitar on top - using only my built in microphone (don't own an external mic).
The introduction is a tone I pitch shifted up with reverb I pitch shifted back down.
I'm enjoying doing this kind of thing, it allows for a lot of freedom.
Let me know thoughts about any part of it!
Thanks,
Gustav Johnson