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Analyze sound live with aubio?

Is there any way for the aubio library to analyze sound live? I can get it to analyze a saved audio file just fine, but it does not seem to want to work with microphone inputs. Documentation for the Python library seems just about non-existent. All I found were these examples, none of which seem to deal with analysis of live input. Has anyone managed to work with live input before, and how is it done?

See https://github.com/aubio/aubio/issues/78 and https://github.com/aubio/aubio/issues/6
Demo here: https://github.com/aubio/aubio/blob/master/python/demos/demo_pyaudio.py
Please open a new issue whenever you have a question, or use https://aubio.org/contact

automatically generate a play using python

To save a lot of work, I'm trying to generate a sound file of a script for a play that includes several different voices. These voices should be computer generated. I have software (NaturalReader13) for generating these voices. Since I don't want the entire play read in one voice, I can't upload the whole text into NaturalReader and export it.
I could export several voice files and then mix them into a coherent whole, but this takes a long time and patience. I tried this already using Audacity to mix. Instead, I want to automate this by interfacing with the program using Python. I have no idea how to do this.
There are free voice generators online that would work for this task, but they are much lower quality. If interfacing with NaturalReaders is too complex, getting the data from the web might be easier.
So basically, the script I have is of the form:
Character: These are the lines that need to be read...
Any ideas on how to approach this?

Python read microphone

I am trying to make python grab data from my microphone, as I want to make a random generator which will use noise from it.
So basically I don't want to record the sounds, but rather read it in as a datafile, but realtime.
I know that Labview can do this, but I dislike that framework and am trying to get better at python.
Any help/tips?

You may be interested by PyAudio. I think you can get some bytes from the stream.
Here is an interesting example

u can refer speech_recognition module or PyAudio module for recording speech.I used PyAudio module with Microsoft cognitive service.It worked fine for me.

How do I mix audio files using python?

I would like to do basic audio mixing in python.
To give an example: I would like to take two mp3 files and add them together and return one mp3 file. Another example: I would like to take the first ten seconds of one mp3 file and add it to the beginning of another mp3 file.
What is the best way to accomplish these tasks? I would like to use built in python functions like audioop but can not find any good tutorials or sample code out there for using the built in functions.
I am going through the docs but I am pretty confused and cannot figure out how to do things like this. I am not even sure that the python libraries like mp3's. Most of the stuff I have looked at seem to refer to WAV files. So, if this is the case, I guess a follow up question would be is there an easy way to convert an mp3 to a WAV for manipulation and back again?

You can do this pretty easily using pydub:
from pydub import AudioSegment
sound1 = AudioSegment.from_mp3("/path/to/file1.mp3")
sound2 = AudioSegment.from_mp3("/path/to/file1.mp3")
# mix sound2 with sound1, starting at 5000ms into sound1)
output = sound1.overlay(sound2, position=5000)
# save the result
output.export("mixed_sounds.mp3", format="mp3")

You could check out some of the code in the python audiotools project. It is a collection of command-line utilities which make use of a common python package. There is a utility included with audiotools (trackcat) which can con*cat*enate two or more audio tracks; another (tracksplit) can split an audio track (using a .cue file). These, as well as the numerous other included utilities, can work with audio files of various encodings, including mp3.

The way I've done this in the past is just use subprocess. and call sox.
E.g. subprocess.call(["sox", "in.1.mp3", "in.2.mp3", "out.mp3"])

High level audio crossfading library for python

I am looking for a high level audio library that supports crossfading for python (and that works in linux). In fact crossfading a song and saving it is about the only thing I need.
I tried pyechonest but I find it really slow. Working with multiple songs at the same time is hard on memory too (I tried to crossfade about 10 songs in one, but I got out of memory errors and my script was using 1.4Gb of memory). So now I'm looking for something else that works with python.
I have no idea if there exists anything like that, if not, are there good command line tools for this, I could write a wrapper for the tool.

A list of Python sound libraries.
Play a Sound with Python
PyGame or Snack would work, but for this, I'd use something like audioop.
— basic first steps here : merge background audio file

A scriptable solution using external tools AviSynth and avs2wav or WAVI:
Create an AviSynth script file:
test.avs
v=ColorBars()
a1=WAVSource("audio1.wav").FadeOut(50)
a2=WAVSource("audio2.wav").Reverse.FadeOut(50).Reverse
AudioDub(v,a1+a2)
Script fades out on audio1 stores that in a1 then fades in on audio2 and stores that in a2.
a1 & a2 are concatenated and then dubbed with a Colorbar screen pattern to make a video.
You can't just work with audio alone - a valid video must be generated.
I kept the script as simple as possible for demonstration purposes. Google for more details on audio processing via AviSynth.
Now using avs2wav (or WAVI) you can render the audio:
avs2wav.exe test.avs combined.wav
or
wavi.exe test.avs combined.wav
Good luck!
Some references:
How to edit with Avisynth
AviSynth filters reference